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To arrive on schedule, a train is to cover a distance of ...

To arrive on schedule, a train is to cover a distance of 60km at 72km/hr. If it starts 10 minutes late, at what speed must it move to arrive on schedule?

A.

60km/hr

B.

80km/hr

C.

90km/hr

D.

108km/hr

Correct answer is C

speed=distancetime72=60timet=6072=56hr
time lost = 10mis =1060hr=16
Time required for the journey
=5616=23speed=60÷23=90km/hr