A student while going to school in a school bus,
observes the average speed of the bus to be
20 km/h. On his return trip along the same way,
the average speed is 30 km/h. What is the average
speed of the bus in the entire journey?
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Explanation:
Average speed =2xy/x+y
=2×30×20/20+30
=2×30×20/50
=2×3×4=24
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