Forty-five minutes after a 40 km/h goods train leaves, an express leaves the same station on the parallel line at 60 km/h. How long after its own start does the express catch up?

Question

Accepted Answer

1.5 hours. Head start =40×0.75=30 km. Gain =20 km/h → 30/20=1.5 h. (2.25 h counts from the goods train's start.)

Forty-five minutes after a 40 km/h goods train leaves, an express leaves the same station on the parallel line at 60 km/h. How long after its own start does the express catch up?

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