Shakiyla J.

asked • 07/11/21

What’s the answer

What’s the answer Alvin paddled for 4 hours with a 5-km/h current to reach a campsite. the return trip against the same current took 9 hours. find the speed of the boat in still water?

1 Expert Answer

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Paul M. answered • 07/11/21

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5.0 (39)

BS Mathematics, MD
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(s+5)4=(s-5)9

is the equation you need where s is the speed in still water and the equation coms from

rate * time = distance.

Can you solve this equation?

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Robert S.

tutor
Paul's answer is correct. The left side 4(s+5) represents the distance traveled over 4 hours with the combined speed of the boat, s, and the river, 5 km/hr. The right side, 9(s - 5), is the distance traveled against the river current. Since both are the same distance, they can be set equal to each other, as Paul has done.
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07/12/21

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