Question

A car travels along a straight line for first half time with speed 40km/h and second half time with 60km/h . Find the mean speed?

Answer 1

Answer:

50 km / hr.

Explanation:

Given :

Let 't' be first half time.

We know :

Distance = Speed × Time

Distance cover first half time = 40 t

Distance cover in second half time = 60 t

Now we are asked to find average speed  :

Average speed = Total distance / Total time taken.

Average speed = 40 t + 60 t / 2 t km / hr

Average speed = 100 t / 2 t km / hr

Average speed = 50 km / hr.

Hence we get required answer.

Answer 2

Answer:50km/h is the mean speed