Train A, which is 200 m long, crosses a pole in 8 seconds. Train B travels at 80% of the speed of Train A. If the two trains cross each other in 16 seconds, find the length of Train B.

500 m
520 m
540 m
560 m

Correct answer: 520 m

Solution

Train A covers 200 m in 8 s, so its speed is 25 m/s. Train B’s speed is 80% of 25 = 20 m/s. Since they cross each other in 16 s, the sum of their lengths is (25+20)d716 = 720 m, so Train B’s length is 720 - 200 = 520 m.

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