Question

A bus moves at a constant rate of 30 km/h for one hour and then at a constant rate of 50 km/h for another one hour. Calculate its average speed.​

Answer 1

Answer:

40 km/h

Explanation:

Case I

Speed of the bus = 30 km/h

Time taken = 1 h

Therefore, we have,

=> Distance travelled = 30 × 1 = 30 km

Case II

Speed of the bus = 50 km/h

Time taken = 1 h

Therefore, we have,

=> Distance travelled = 50×1 = 50 km

Now, to find the average speed.

We know that,

Average speed = Total distance/Total time

Here, we have,

Total distance = 30+50 = 80 km

Total time = 1+1 = 2 h

Therefore, we will get,

=> Average speed = 80/2

=> Average speed = 40

Hence, average speed of the bus is 40 km/h.