Question

A car covers the first half of its distance between two places at a speed of 40km/hr and the second half at 60 km/hr . The average speed of the car is 12n km/hr. Find n.

Answer 1

Here is your answer check it.

Answer 2

v1 = 40 km/h   v2 = 60 km /h 
Average speed v =  (v1 + v2)/2                             v = (40 + 60)/2= 50 km/h
12n=50
n=50/12
=n=4.16