Question

a car travels 30km at a uniform speed of 40 km/h and the next 30 km at a uniform speed of 20km/h. find its average speed?

Answer 1

for 30km distance time=30/40=3/4
for next 30km distance=30/20=3/2

AVERAGE SPEED=TOTAL DISTANCE/TOTAL TIME
=30+30/3/4+3/2
=60/9/4
=240/9=26.66