Question

a car travels 30 km at speed of 40 km h and next 30 km at uniform speed 20 km h find its average spedd

Answer 1

first
distance=30km
speed=40km/h
time=distance/speed
=30/40=0.75hr

second
distance =30km
speed =20km
time =distance / speed
=30/20=1.5hr

average speed =total distance /total time
=60km/2.25hr
=26.6667