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A man takes 10 hours to go to a place and come back, by walking both the ways. He could have gained 2 hours by riding both the ways. The distance covered in the whole journey is 18 miles. Find the average speed for the whole journey if he goes by walking and comes back by riding.

A man takes 10 hours to go to a place and come back, by walking both the ways. He could have gained 2 hours by riding both the ways. The distance covered in the whole journey is 18 miles. Find the average speed for the whole journey if he goes by walking and comes back by riding. Correct Answer 2 mph

Time taken on walking both ways = 10 hrs

Time taken on walking one way = 5 hrs

Time taken on riding both ways = 10 - 2 = 8 hrs

Time taken on riding one way = 4 hrs

∴ Average speed = 18/(5 + 4) = 18/9 = 2 miles per hour

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