A motorboat heads upstream a distance of 24 miles on a river whose current is running at 3 miles per hour. The trip up and back takes 6 hours. Assuming that the motorboat maintained a constant speed relative to the water, what was its speed?

Question

DavidE · Answer

9mph is the boat's actual speed. 12mph with the stream and 6mph against the stream. 12mph takes 2 hours to get there and 6mph takes 4 to get back = 6hours.

Anonymous · Answer

To get speed you do Distance/Time.

DavidE · Answer

The speed of the motorboat in still water is 9 mph. It travels at 6 mph against the current and 12 mph with it. This speed allows the total trip to take 6 hours as given in the problem. 
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A motorboat heads upstream a distance of 24 miles on a river whose current is running at 3 miles per hour. The trip up and back takes 6 hours. Assuming that the motorboat maintained a constant speed relative to the water, what was its speed?

Answer (3)

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