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A man cycles from home to work at 15 km/h and returns at 20 km/h. If the next day he...
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The man cycles from home to work at 15 km/h and returns at 20 km/h.
If the speed of going is increased by 5% an the speed at which he returns is decreased by 10%, the respective speeds are 15*(1+0.05) = 15.75 km/ h and 20*(1 - 0.1) = 18 km/h.
The average speed is now (15.75 + 18)/2 = 16.875 km/h
Posted by justaguide on July 4, 2013 at 5:23 AM (Answer #1)
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