Question

Kaushal drive a car at a speed of 70 km/hr in a straight road for 8.4 km, and then the car runs out of petrol. You walk for 30 minutes 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.​

Answer 1

Explanation:

Total displacement = 8.4 + 2 = 10.4 km

Total time taken = 1/2 + 8.4/70 = 0.62 h

We know,

Average velocity = Displacement/Total Time taken

= 10.4 km/0.62 h

We get,

= 16.8 kmh-1

Therefore, the correct option is (a)