A 150 m train passes a lineman walking along the track in its direction at 3.6 km/h in 10 seconds. Ahead lie a 400 m tunnel and, 1150 m past the tunnel's exit, a 300 m bridge. How long is it from the engine entering the tunnel until the last coach leaves the bridge?

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Accepted Answer

125 s. Relative speed =150/10=15 m/s, so the train runs at 15+1=16 m/s. Distance =400+1150+300+150=2000 m → 125 s. (133.3 s forgets to add the lineman's speed.)

A 150 m train passes a lineman walking along the track in its direction at 3.6 km/h in 10 seconds. Ahead lie a 400 m tunnel and, 1150 m past the tunnel's exit, a 300 m bridge. How long is it from the engine entering the tunnel until the last coach leaves the bridge?

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