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A bicyclist travels uphill from town A to town B for 2 hours at an average speed of 4 miles per hour and returns along the same road at an average speed of 6 miles per hour. What is the bicyclist’s average speed for the round trip, in miles per hour?
Re: A math problem, pls help to solve it [#permalink]
28 Jun 2011, 23:24
For the onward journey the distance travelled is 4*2 = 8 miles backward journey same distance 8 miles and he travelled at 6 miles per hour so time taken = 8/6 = 4/3 Average speed = Total Disatance travelled/Total time taken = 16/(2+4/3) solving the above we get 24/5