A goods train leaves Hyderabad at 7 a.m. at 50 km/h. An express leaves the same station at 9 a.m. at 70 km/h on a parallel line in the same direction. How far from Hyderabad will the express catch up?

Question

Accepted Answer

350 km. Head start =50×2=100 km. The express gains 20 km/h, so it needs 5 h. Distance =70×5=350 km. (250 km is the goods train's run during those 5 h only.)

A goods train leaves Hyderabad at 7 a.m. at 50 km/h. An express leaves the same station at 9 a.m. at 70 km/h on a parallel line in the same direction. How far from Hyderabad will the express catch up?

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