Question

a car moves a distance of 200 m. it covers the first half of of the distance at speed 40 km/h and second half at speed v. the average speed is 48 km/h. the value of v is

Answer 1

Let half dist = d= 100m
48= 2d/(d/40+d/v)
24= v×40/40+v
40v= 24v+ 960
v=960/16= 60 m/sec