Question

A car travels at a speed of 80km/h during the first half of its running time and at 40km/h during the other half. Find the average speed of the car?​

Answer 1

Answer:

60 km/h

Step-by-step explanation:

Total distance covered = (40+20) km = 60 km

Total time taken = 1 hour

Hence, average speed = 60 km/h

Answer 2

PHYSICS

Average Speed

Answer:

Refer to attached picture of diagrammatical representation.

Let the time taken in each half be t.

During the first half, speed of the car = 80 km/hr

Therefore, distance in first half (d1) = 80t km

During the second half, speed of the car = 40 km/hr

Distance (d2) = 40t km

Total distance, d = d1 + d2 = 80t + 40t = 120t

Total time taken in both the cases (T) = t + t = 2t

Average speed ($v_{av}$) = 120t/2t = 60 km/hr

Therefore the required answer is 60 km/hr.

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