A body moving at a speed of 40 km/hr covers a distance of 50 km, and returns at a speed
of 60 km/hr to reach the point where it started. Calculate its average speed in S.I. units.
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Step-by-step explanation:
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Letx consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,t
1= 2×40x= 80x
hr. . . . .(1)
The time taken to complete another half distance with velocity u=60km/ht
2 = 2×60x = 120xhr
The total time taken, t=t
1 +t 2t= 80x + 120x = 48x hr
The average speed of the car, v avg= x/48x
=48km/h
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