Question

A car moves first 20 km at a speed of 50 km/h and the next 20 km at a speed of 70 km/h . Calculate the average speed of the car .

Answer 1

Average speed if distance is same..,

v1 = 50 km/hr
v2 = 70 km/hr

Avg. speed = 2v1v2 / ( v1+v2 )

= 2(50)(70) / ( 50 + 70 )

= 7000/ 120

= 58.33 km/hr

= 16.20 m/s

Thanks !