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 Sujet: speeds
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 Why can't we add or subtract speed? 2013-11-21 kashish pose la question :why we cannot add or subtract "speed" / directly in any given distance , speed , time questions?Chris Fisher lui répond. Adding speeds 2012-08-26 Roy pose la question :May I ask if it is correct to add the following with units included? Some tell me that the units cannot be included in the addition because we cannot add speed.Harley Weston lui répond. Two rate problems 2002-09-30 Rebecca pose la question : There are two small holes in the bottom of a tub filled with water. If opened, one hole will empty the tub in three hours; the other will empty it in six hours. If both holes are opened at the same time, how long will it take to empty the tub? An airplane flies 400 miles per hour in calm air. It can cover 900 miles flying with the wind in the same time that it can cover 700 miles against the wind. What is the speed of the wind? Penny Nom lui répond.

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