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A car is moving on a straight road cover...

A car is moving on a straight road covers one third of the distance with a speed of 20 km/h and the rest with a speed of 60 km/h. The average speed of the car is

A

40 `(km)/(hr)`

B

80 `(km)/(hr)`

C

`46(1)/(2)(km)/(hr)`

D

36 `(km)/(hr)`

Text Solution

Verified by Experts

The correct Answer is:
D
average speed `=(t otal dista nce)/(total time)=(x)/(t_1+t_2)`
`=(x)/(((2x)/(5))/(v_1)+((2x)/(3))/(v_2))=(1)/((1)/(3xx20)+(2)/(3xx50))=36(km)/(hr)`
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