# Interview Question

Found 16th May 2008
Hey people.

I had an interview for my first post-uni job today. One of the questions i was asked is shown below. Can any of you work out the answer?! Exciting!

A train travels from A to B. 1 hour through the journey there is a problem with the engine. The rest of the journey has to continue at 3/5 of the speed. The train arrived 2 hours later than it should have. The captain stated that if they had experienced the engine problem 50 miles later into the journey, they would have arrived 40 minutes earlier.

What is the distance, in miles, between A and B?

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Banned

The answer is B....anyhow if it takes 2 hours to fix the engine it takes 2 hours to fix the engine, just because you break down somewhere else doesn't mean it will take any less time to fix the engine, unless you so happen to break down outside the depot.

Bloody difficult to be a bin man aint it?

lumoruk;2115265

:thumbsup::w00t::roll:

165 miles. It takes 40 minutes to do 50 miles at full speed. Therefore 1.25 miles per minute. so for the first hr it travels 75 miles. if for the next 2 hrs it travels at 3/5 of the speed then it travels at 0.75 miles per minute, so for 2hours that would cover 90 miles. Therefore the total distance is 165 miles?

Original Poster

We have ourselves a weiner! good work.

As for the answer being B - fail. ;p

Ooops all wrong!!!!

Its a trick question what are are failing to observe is that Trains do not have captains!!

yasseral1;2115304

165 miles. It takes 40 minutes to do 50 miles at full speed. Therefore … 165 miles. It takes 40 minutes to do 50 miles at full speed. Therefore 1.25 miles per minute. so for the first hr it travels 75 miles. if for the next 2 hrs it travels at 3/5 of the speed then it travels at 0.75 miles per minute, so for 2hours that would cover 90 miles. Therefore the total distance is 165 miles?

:whistling:

Original Poster

here is another i was asked:

There are 4 people on a walk. They get to an old rickety bridge that they have to cross. It is only safe for 2 of them to cross at a time. It is also dark and a torch needs to be carried accross and brought back for the next crossing. One of the people is injured and will take 10 minutes to cross the bridge, another will take 4 minutes to cross the bridge, another 2 minutes and the 4th person takes 1 minute.

what is the shortest time that they can all cross the bridge?

18 minutes if the person who can do it in 1 minute takes the torch,

10 mins + 1 min return on first leg
4 mins + 1 min return second
2 mins no return for third leg

take the boat, wheres my prize?

morris7;2115378

here is another i was asked:There are 4 people on a walk. They get to an … here is another i was asked:There are 4 people on a walk. They get to an old rickety bridge that they have to cross. It is only safe for 2 of them to cross at a time. It is also dark and a torch needs to be carried accross and brought back for the next crossing. One of the people is injured and will take 10 minutes to cross the bridge, another will take 4 minutes to cross the bridge, another 2 minutes and the 4th person takes 1 minute.what is the shortest time that they can all cross the bridge?

18 minutes:thumbsup:

Original Poster

yeah, i put that the quick guy should take them all too. harltzer has the correct time, yasseral1. you must have added wrong, lol

Original Poster

skusey, stop pretending you didn't get that answer from harltzer ;p

morris7;2115466

skusey, stop pretending you didn't get that answer from harltzer ;p

i never, the missus got it:whistling:

yeah i thought there were two 4 minute people. Misread- my bad.

Yeah but since when did trains have captains? That still puzzles me!

Btw what job were you going for?

Original Poster

yeah there were more, umm.......

there's a room that measures 12x12x30m. there is a spider situated in the middle of one of the smaller walls, 1m from the top of the wall. On the opposite wall it sees a fly. the fly is situated 1m from the bottom of the wall, again, in the middle. what is the shortest distance that the spider can walk to get to the fly? (it has to walk, no webs or anythign like that!)

Original Poster

yasseral1;2115499

Btw what job were you going for?

it was a software developer job

42 meters. It seams a bit too simplistic. Am i missing something?

18 minutes and the first one has given me a headache. Any more? I like these - but may have to do in the morning! Here is one for you - My sons SATs question -

I am Thinking of a number I take half of the number and add a quarter of the number and the answer is 60. What number was I thinking of to start with?:thinking:

Original Poster

correct

i am out of Q's now! cheers for the particiaption everyone!

Original Poster

Bargaingirl;2115545

18 minutes and the first one has given me a headache. Any more? I like … 18 minutes and the first one has given me a headache. Any more? I like these - but may have to do in the morning! Here is one for you - My sons SATs question - I am Thinking of a number I take half of the number and add a quarter of the number and the answer is 60. What number was I thinking of to start with?:thinking:

is it 96?!

Bargaingirl;2115545

18 minutes and the first one has given me a headache. Any more? I like … 18 minutes and the first one has given me a headache. Any more? I like these - but may have to do in the morning! Here is one for you - My sons SATs question - I am Thinking of a number I take half of the number and add a quarter of the number and the answer is 60. What number was I thinking of to start with?:thinking:

80:whistling:

Nice. Good luck for the job!

Very good Skusey - you are as smart as a 10 year old! (key stage 2 sats!)

Bargaingirl;2115545

18 minutes and the first one has given me a headache. Any more? I like … 18 minutes and the first one has given me a headache. Any more? I like these - but may have to do in the morning! Here is one for you - My sons SATs question - I am Thinking of a number I take half of the number and add a quarter of the number and the answer is 60. What number was I thinking of to start with?:thinking:

80

Original Poster

skusey;2115563

80:whistling:

ah, i think there are 2 answers depending on how you read the question. i took the quarter from the number you get after halfing it...

which is the answer they are after?

Original Poster

i.e.
96 / 2 = 48
1/4 of 48 = 12
48 + 12 = 60

80 - I think its my typing with the headache - you gave me from the first question!

Bargaingirl;2115578

Very good Skusey - you are as smart as a 10 year old! (key stage 2 sats!)

:thumbsup::oops:
I am only 6 months old:thumbsup:

Original Poster

lol. nah i think you typed it right, i just jumped to conclusions. i always tend to over complicate things

Well i am a huge Columbo fan - so will let you off!

Original Poster

columbo is awesome. more people should be like you

Aren't you going to say something nice about my picture? I have no idea why I chose it - it was funny at the time!

Original Poster

oh yeah, sorry. how rude of me! you're picture is.....umm.....really....umm....sexy?

lumoruk;2115265

The answer is B....anyhow if it takes 2 hours to fix the engine it takes … The answer is B....anyhow if it takes 2 hours to fix the engine it takes 2 hours to fix the engine, just because you break down somewhere else doesn't mean it will take any less time to fix the engine, unless you so happen to break down outside the depot.

"Just one more thing" ( as our idol says)....any more questions?

harlzter;2115415

18 minutes if the person who can do it in 1 minute takes the torch, 10 … 18 minutes if the person who can do it in 1 minute takes the torch, 10 mins + 1 min return on first leg4 mins + 1 min return second2 mins no return for third leg

You can save more time if the 10 and 4 minute people go together :-)

2 & 1 cross: 2 min
1 returns: 1 min
10 & 4 cross: 10 min
2 returns: 2 min
2 & 1 cross: 2 min

Total: 17 min

harlzter;2115484

Yeah but since when did trains have captains? That still puzzles me!

It doesn't even say the Captain was driving the train. He could of just been a passenger.