Question

A man travels half the distance between Town A and Town B at an average speed of 90 kmph. What should be his average speed for the rest of the journey so that his overall average speed for the journey between Town A and B is 60 kmph?




with solution​

Answer 1

Answer:

Explanation:

He travelled one half at 90 km/h.

90 km/h by x plus y km/h by z equals (60 km/h)(x plus z)

we don't know the later speed and time travelled.

90 x equals y multiplied by z

both equal 30 by (x+z)

x+z equals 3x and z equals 2x

so 180 x

let's try the other way

90 km/h