Question

An object moves first half of the total distance with the speed of 40km/h in a straight line. Find it's constant speed for the second half of the total distance if the average speed of entire trip is 60km/h

Answer 1

By formula.
$av.speed = \frac{2 \times v1 \times v2}{v1 + v2}$
60=(2 x 40 x v2) / 40 +x



X=120kmph