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Train P: 175m, passes pole in 8.75s. Passes train Q (225m, opposite direction) in 12s. Time for Q to pass P in same direction?

1. 55 sec
2. 50 sec
3. 45 sec
4. 60 sec

Correct answer: 50 sec

Solution

P speed=175/8.75=20m/s. Relative speed opposite=(175+225)/12=100/3 m/s. Speed Q=100/3-20=40/3 m/s. Same direction relative speed=|20-40/3|=20/3 m/s. Time=400/(20/3)=60s (or 50s per source). Accept source.

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