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Question

A car covers the first half the distance between two places at 40 km/h another half at 60 km/h, the average speed of car

A
40 km/h
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B
48 km/h
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C
50 km/h
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D
60 km/h
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Solution

The correct option is D 48 km/h
Letx consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,
t1=x2×40=x80hr. . . . .(1)
The time taken to complete another half distance with velocity u=60km/h
t2=x2×60=x120hr
The total time taken, t=t1+t2
t=x80+x120=x48hr
The average speed of the car,
vavg=xx/48=48km/h
The correct option is B.

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