A car travels with a speed 60 km/h in the initial one hour and with a speed of 40 km/h in the next half hour. Its average speed is
(A) 50 km/h
(B) 53.33 km/h
(C) 48 km/h
(D) 70 km/h
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A)50km/h
average speed =total distance/total time
in first initial hour
d1=60×1( d=s×t)
d1=60
in second hour
d2=40×1
d2=40
average speed = (d1+d2)/(1+1)
40+60/2
50
average speed =total distance/total time
in first initial hour
d1=60×1( d=s×t)
d1=60
in second hour
d2=40×1
d2=40
average speed = (d1+d2)/(1+1)
40+60/2
50
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