Question

A student while going to school in a school bu, observes the average speed of the bus to be 20km/h. On his return trip along the same way, the average speed is 30km/h. What is the average speed of the his in the entire journey?

Answer 1

total speed doring whole journey =
30+20 km/h=50 km/h
therefore
average speed = 50/2

= 25km/h
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Answer 2

suppose, the distance of the road = x km
then, the average speed
=2x/(x/20+x/30) km/h
=2x/(5x/60) km/h
=2x*60/5x km/h
=2*12 km/h
=24 km/h (Ans)