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You drive a car at a speed of 70 km//h i...

You drive a car at a speed of `70 km//h` in a straight road for 8.4 km, and then the car runs out of petrol. You walk for 30 min to reach a petrol pump at a distance of 2 km. The average velocity from the beginning of your drive till you reach the petrol pump is

A

16.8 km/hr

B

35 km/hr

C

64 km/hr

D

18.6 km/hr

Text Solution

Verified by Experts

The correct Answer is:
A
`v_(avg) = ("total distance")/("total time") = (8.4 km+ 2km)/([ (8.4)/(70) + 1/2]hr)`
`= (10.4)/(0.62) = 16.8 km//hr`
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