math
posted by lea .
A boat is rowed down a river a distance of 16 miles in 2 hours and it is rowed upstream the same distance in 8 hours. Let r represent the rate of the boat in still water in miles per hour, and let c represent the rate of the stream in miles per hour. Write the equation. What is the still water speed and rate of the stream?

math 
Reiny
still water speed of boat  x mph
speed of river current  y mph
2(x+y) = 16
x+y = 8
8(xy) = 16
xy = 2
add them
2x = 10
x = 5, then y = 3
state the conclusions.
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