Question

A car travels 30km at uniform speed of 40km and the 30km at aspeed of 20km . find the average speed

Answer 1

time=distance/speed

time 1=30/40 =0.75h

time 2=30/20 =1.5h

average speed= total distance/total time
=(30+30) / (0.75+1.5)
26.7 km/h