Elephants12
29.10.2019 •
Mathematics
Raft 16 miles with river current.at end of 16 miles turns around and rafts against river current. overall the journey takes 4 hours he can raft 9 mph in still water. what is speed of current
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Ответ:
Let the speed of the current of the river be = x
And, the speed of the boat in still water = 9 mph
Then, the speed of boat along the river current will be= 9+x mph
And, speed of boat against the river current will be = 9-x mph
Now as given, total distance along river current and total distance against river current is same = 16 miles.
As we know, time=distance/speed
Time taken by boat along the river current =
And time taken by boat against the river current =
Also given is , the overall the journey takes 4 hours; so equation becomes
Solving this we get; or x=3
Therefore, the speed of the current of the river is 3 mph.
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