How Long is the Train?

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A train moving 45 miles per hour meets and is passed by a train moving 36 miles per hour. A passenger in the first train sees the second train take 6 seconds to pass him. How long is the second train in feet?


The answer is 712.8.

Lesia Zhurba by Lesia Zhurba , 14, USA

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1 solution

Lesia Zhurba
Sep 8, 2020

The speed of the passenger in the first train, in relation to the movement of the second train, is 45 + 36 = 81 \boxed{81} miles per hour.

or

5280 × \times 81 divided by 60 × \times 60 = 118.8 \boxed{118.8} feet per second

Therefore, the length of the second train is 6 × \times 118.8 = 712.8 \boxed{712.8} feet

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