Question

A car moves for half of its total travel time with the speed 80 km per hour and for next half of the time at for 4
0 kilometre per hour the total distance covered it 60 km find the average speed of the car

Answer 1

ANSWER

THE AVERAGE SPEED IS

$= \frac{60}{ \frac{60}{2} \times( \frac{1}{80} + \frac{1}{40} )} \\ = \frac{80 \times 40 \times 2}{80 + 40} \\ = \frac{6400}{120} \\ = 53.33 \: \: km.h {}^{ - 1}$