Question
A person travels between three towns as follows:
type="disc"> From Town X to Town Y, he covers 120 km at 60 km/h. From Town Y to Town Z, he covers 150 km at 75 km/h. On the return trip: From Town Z to Town Y, he travels at 50 km/h. From Town Y to Town X, he travels at 40 km/h. What is the average speed for the entire journey? 50 km/hSolution
Time taken by person from town X to town Y = 120/60 = 2 hours Time taken by person from town Y to town Z = 150/75 = 2 hours Time taken by person from town Z to town Y = 150/50 = 3 hours Time taken by person from town Y to town X = 120/40 = 3 hours 
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