SOLUTION: sasha can row her boat 5 miles per hour on still water. She could travel 48 miles downstream in twice the tim eit takes to travel 6 miles upstream. What is the speed of the water
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Question 978972: sasha can row her boat 5 miles per hour on still water. She could travel 48 miles downstream in twice the tim eit takes to travel 6 miles upstream. What is the speed of the water
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the speed of the current
mi/hr = the speed of the boat in still water
Let = time in hrs to travel upstream
--------------------
Going downstream:
(1)
Going upstream:
(2)
----------------------
(1)
(2)
----------------------
(2)
By substitution:
(1)
(1)
(1)
(1)
---------------
(2)
(2)
(2)
(2)
The speed of the current is 3 mi/hr
check:
(1)
(1)
(1)
(1)
OK
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