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It took a boat 2 hours to reach town A going upstream. The way back was 1h20 min. What is the speed of the boat in still water if the speed of the stream is 3 mph?

Jan 30, 2020

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It took a boat 2 hours to reach town A going upstream. The way back was 1h20 min. What is the speed of the boat in still water if the speed of the stream is 3 mph?

Hello Guest!

$$(v-3\ mi/h)\cdot 2h=(v+3\ mi/h)\cdot \frac{4}{3}h\\ 2v-6mi/h=\frac{4}{3}v+4mi/h\\ \frac{2}{3}v=10mi/h$$

$$v=15\ mi/h$$

The speed of the boat in still water is 15 mph

!

Jan 31, 2020