Asked by math101

A river flows at the rate of 7km/hr. A patrol boat travels 46 km upriver and returns in a total time of 15hr. What is the speed of the boat in still water?

Answers

Answered by oobleck
time = distance/speed
so, if the boat's speed is s, we have
46/(s+7) + 46/(s-7) = 15
Now just solve for s
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