SOLUTION: Alvin paddled for 3 hours with a 5​-km/h current to reach a campsite. The return trip against the same current took 8 hours. Find the speed of the boat in still water.
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Question 1129054: Alvin paddled for 3 hours with a 5-km/h current to reach a campsite. The return trip against the same current took 8 hours. Find the speed of the boat in still water.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = speed of boat in still water
= speed going with the current
= speed going against the current
Let = the one-way distance
----------------------------------------------------
Going with the current:
(1)
Going against the current:
(2)
--------------------------------
The speed in still water is 11 km/hr
-------------------------------------------
check:
(1)
(1) km
and
(2)
(2) km
OK
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