SOLUTION: Please help.
A boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount as it takes to go 9 miles upstream,then what is the speed of the
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A boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount as it takes to go 9 miles upstream,then what is the speed of the
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Question 177010: Please help.
A boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount as it takes to go 9 miles upstream,then what is the speed of the current? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! A boat will go 15 miles per hour in still water. If he can go 12 miles downstream
in the same amount as it takes to go 9 miles upstream, then what is the speed of the current?
;
let x = speed of current
;
write a time equation: time =
upstr time = downstr time =
cross multiply
9(15+x) = 12(15-x)
;
135 + 9x = 180 - 12x
;
9x + 12x = 180 - 135
;
21x = 45
x =
x = 2.143 mph current speed
:
:
check solution = =
.7 = .7; confirms solution
