A ticket checker walks from the last coach to the engine of a 300 m train at 1.5 m/s (relative to the train) while the train runs at 54 km/h. How far does the checker travel over the ground during the walk?

Question

Accepted Answer

3.3 km. Walking 300 m at 1.5 m/s takes 200 s. Over the ground he moves at 15+1.5=16.5 m/s → 16.5×200=3300 m =3.3 km. (3 km is the train's own run.)

A ticket checker walks from the last coach to the engine of a 300 m train at 1.5 m/s (relative to the train) while the train runs at 54 km/h. How far does the checker travel over the ground during the walk?

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