A 280 m train crosses a 170 m bridge in 30 seconds. On the same run it overtakes a lineman walking at 3.6 km/h in its direction. How long does it take to pass the lineman?

Question

Accepted Answer

20 s. Speed =280+170/30=15 m/s. Lineman =1 m/s, so relative speed =14 m/s. Time =280/14=20 s. (17.5 s adds his speed; 18.7 s ignores it.)

A 280 m train crosses a 170 m bridge in 30 seconds. On the same run it overtakes a lineman walking at 3.6 km/h in its direction. How long does it take to pass the lineman?

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