A car covers four successive 7 km distance at speeds of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr , respectively . Its average speed over this distance is :
A. 40 km/hr
B. 30 km /hr
C. 20 km/hr
D. 50 km/hr
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সঠিক উত্তরঃ
C.
20 km/hr
Explanation:
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