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Vesnalui
13 days ago
6

The distance between two piers on a river is 45 miles. It takes a motorboat, moving downriver, 2 hr 15 min to complete the journ

ey. How much time does it take the same boat to go back upstream if the current flows at 2.5 mph?
Mathematics
1 answer:
PIT_PIT [12.4K]13 days ago
3 0
The duration is 3 hours. We can define a variable for our answer (x). Now we need to determine the boat's speed in still water (y). We can establish this equation: d/t = s: 45/(y + 2.5) = 2 1/4, leading us to find y = 17.5. Substituting in the current’s speed gives us y - 2.5. So, 17.5 - 2.5 is 15. By solving for x, we get 45/15 = 3, which gives us the final answer of 3 hours.
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