Question

A car travels the half of distance of its journey with a speed of 40 km and the second half of the distance with speed v. If the average spe of car is 48 km/h then the value of v​

Answer 1

Explanation:

Let the total distance be 2d.

Half journey distance = d

First half speed = 40km/hr

Time taken = d/40

Remaining half distance 'd'

speed is = v

Time taken = d/v

Total time = d/40 + d/v

Total distance = 2d

Avg speed = Total dist/Total time

= 2d/ (d/40+d/v)

= 2 / (1/40+1/v) = 48

1/40 + 1/v = 1/ 24

40v / 40+v = 24

40v = 960 + 24v

16v = 960

v = 60km/hr