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?
1 answer:
Answer: 3 hours
Step-by-step explanation: we can make a variable for our answer(x)
Now, we need to find the speed of the boat without the current (y)
we can make this equation: d/t = s: 45/(y + 2.5) = 2 1/4
hence: y = 17.5
now we can substitute in the current's speed: y -2.5
17.5 - 2.5 is 15
now we can solve for x
45/15 = 3
hence, we get 3 hours as our answer
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