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Mathematics 10 Online
OpenStudy (perl):

A motorboat makes a round trip on a river 56 miles upstream and 56 miles downstream, maintaining the constant speed of 15 mph relative to land. The entire trip up and back takes 7.5 hours. What is the speed of the current?

OpenStudy (radicalsniper):

|dw:1348613506324:dw| What is t?

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