SOLUTION: a boat travels 40 miles down stream in 4 hours. The 40 mile return up stream takes 10 hours. What is the speed of the current?

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Question 279516: a boat travels 40 miles down stream in 4 hours. The 40 mile return up stream takes 10 hours. What is the speed of the current?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
4(x+c)=40
10(x-c)=40
4x+4c=40
10x-10c=40
x+c=10
x-c=4
2x=14
x=7
7+c=10
c=3
c=3 x=7
check
4(10)=10(7-3)
40=40
ok