Anil travels a certain distance by car at a speed of 75 km/h and comes back to the starting point via same route by bike with speed of 45 km/h. Find the average speed (in km/h) of Anil.
When distance travelled is same, then average speed = 2ab/(a + b) (where 'a' and 'b' are two different speeds) . Therefore, required average speed = (2 x 75 x 45) ÷ (75 + 45) = (6,750/120) = 56.25 km/h
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