Made easy Test series

Question

Rajesh traveled from home to school at 30 miles per hour. Then he returned home at 40 miles per hour, and he finally went back to school at 60 miles per hour, all along the same route. What  was his average speed for the entire trip,in miles per hour?

Comments

Ans given is 40

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let's say the distance b/w home and school is x miles,

Total distance = 3x miles
Total time taken = x/30 + x/40 + x/60

Avg. speed = 3x / (x/30 + x/40 + x/60) = 1800/45 = 40.