Question

Parag starts chasing a Vipul, 6 hours after the Vipul starts running. Parag takes 7 hours to catch the Vipul. If the average speed of the Parag is 39 km/hr, find the average speed of the Vipul?

A 10 km/hr
B 20 km/hr
C 9 km/hr
D 21 km/hr
E 12 km/hr
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