Question

A man is travelling at a speed of 40 km/h such that he will take 90 minutes to reach his destination. But after completing half the journey, the man took a break of 15 minutes and then continued his journey. Find the speed at which the man must cover rest of the journey to reach his destination in original time.

A 50 km/h
B 72 km/h
C 60 km/h
D 48 km/h
E None of these
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