Question

a car covers first half of the distance between two points at the speed of 40 kmph and the second half of the distance at the speed of 60 kmph calculate the average speed of the car

Answer 1

A car covers the first half of the distance between two places at a speed of
40km/hr and second half at 60 km/hr . calculate the average speed of the car
:
let a = average speed for the trip
let d = half the distance
:
write a time equation, time = dist/speed
 +  = 
we don't need d, divide thru by d and you have
 +  = 
multiply by 120a to clear the denominators, results:
3a + 2a = 120(2)
5a = 240
a = 240/5
a = 48 km/hr