SOLUTION: 1. A boat goes 220 miles downstream in the same time it can go 180 miles upstream. The speed of the current is 5 miles per hour. Find the speed of the boat in still water.

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Question 275675: 1. A boat goes 220 miles downstream in the same time it can go 180 miles upstream. The speed of the current is 5 miles per hour. Find the speed of the boat in still water.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
r*t=d
(b+5)*t=220
(b-5)*t=180
t=220/(b+5)
t=180/(b-5)
220/(b+5)=180/(b-5)
220(b-5)=180(b+5)
220b-220*5=180b+180*5
40b=400*5=50*40
b=50