Question

A car covers a distance of 120 km with a speed of 60 km/hour and another 60 km with an
average speed of 30 km/hour. Find the average speed of the car over the whole journey.​

Answer 1

40 kmph is your answer.. ↓↓

Consider the following situation:

Distance to be travelled = 120 km

1/2 distance = 60 km

Now, left distance is 60 km

To travel 60 km at the speed of 60 km/h, Time taken = 1 hour

To travel 60 km at the speed of 30 km/ h, Time taken = 2 hour

Total distance traveled = 120 km

Total time taken for journey = (1+2) hrs = 3 hrs

Therefore Average Speed = total distance ÷ total time taken = 120/3 = 40 km/h.

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