  |  Pilot Light Join Date: Jul 2007 Posts: 312 |
Interview Question
POSTED BY: morris7 1 month, 2 weeks agoHey 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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lumoruk:
The answer is B    |
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Last edited by yasseral1 : 16-05-2008 at 21:45. |
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Last edited by harlzter : 16-05-2008 at 21:48. |
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yasseral1:
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?   |
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morris7:
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? |
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morris7:
skusey, stop pretending you didn't get that answer from harltzer ;p got any more please |
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