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A train A of length 80 m crosses a pole in 16 seconds while moving. If the lengths of train B and train A are in the ratio 3:1, then how long would it take train B to cross a platform whose length is half the length of train A, if the speed of train B is the same as that of train A?

1. 48
2. 56
3. 28
4. 64

Correct answer: 56

Solution

Train A crosses 80 m in 16 s, so its speed is 5 m/s. Train B is 240 m long, and the platform is 40 m long, so total distance covered is 280 m. At 5 m/s, the time taken is 56 seconds.

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