SOLUTION: Show a complete solution to problem. Junior's boat will go 15 miles per hour in stillwater. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles u

Question 192772: Show a complete solution to problem.
Junior's boat will go 15 miles per hour in stillwater. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
d=st d=istance, s=speed, t=time
t=d/s
Let c=speed of current
12/(15+c)=9/(15-c) time going downstream = time going upstream
12(15-c)=9(15+c) multiply each side by the denominators to eliminate fractions.
180-12c=135+9c
-21c=-45
c=15/7=2.14... mph speed of current
.
Ed

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