Train, math question! If a train is 4.8miles long and traveling at a speed of...

Jess

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May 13, 2008
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...75mph...? If a train is 4.8miles long and traveling at a speed of 75mph, and you are waiting at the railroad crossing for the train to pass, approximately how many minutes will you be waiting from the time it enters the crossing until it has completely passed.

Please explain your math because it's driving me insane. It's 2am and I'm at work trying to solve this. This seems like a simple mathematical equation and yet my brain is just not working it.
 
we know a train traveling 75mph travels 75 miles in one hour or 60 minutes. if you divide 75 miles by 60 minutes you get how many miles the train travels in 1 minutes which is 1.25 miles. so if the train travels 1.25 miles in one minute then how long will it take to travel 4.8 miles? now you take 4.8 miles divided by 1.25 miles to find out how many minutes it takes the train to carry it's full length through the crossing

the answer is 3.84 minutes
 
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