SOLUTION: A motorboat travels upstream at 7 mph, while it travels downstream at 12 mph. What is the speed of the motorboat in still water? What is the speed of the current?

Question 764352: A motorboat travels upstream at 7 mph, while it travels downstream at 12 mph. What is the speed of the motorboat in still water? What is the speed of the current?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A motorboat travels upstream at 7 mph, while it travels downstream at 12 mph. What is the speed of the motorboat in still water? What is the speed of the current?
***
let x=speed of boat in still water
let c=speed of current
(x+c)=speed of motorboat downstream
(x-c)=speed of motorboat upstream
..
x-c=7
x+c=12
add
2x=19
x=9.5
c=x-7=2.5
speed of boat in still water=9.5 mph
speed of current=2.5 mph
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