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

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



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