SOLUTION: A crew times itself on a three-mile course. The three miles upstream takes 20 minutes, and the three miles downstream takes 12 minutes. Find the rate of the crew in still water.

Question 901434: A crew times itself on a three-mile course. The three miles upstream takes 20 minutes, and the three miles downstream takes 12 minutes. Find the rate of the crew in still water.
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A crew times itself on a three-mile course. The three miles upstream takes 20 minutes, and the three miles downstream takes 12 minutes. Find the rate of the crew in still water.
***
let x=rate in still water
let c=rate of current
x+c=rate of crew downstream
x-c=rate of crew upstream
distance/speed=travel time
..
12 min=1/5 hr
20 min=1/3 hr

x+c=15
x-c=9
add
2x=24
x=12
c=x-9
c=3
rate in still water=12 mph
RELATED QUESTIONS
A crew rows 4 miles downstream and 2 miles upstream in one hour. Then it rows 6 miles... (answered by mananth)

A motorboat can go 14 miles downstream on a river in 20 minutes. It takes 30 minutes for... (answered by checkley77)

A motorboat can go 8 miles downstream on a river in 20 minutes. It takes 30 minutes for... (answered by checkley77)

A motorboat can go 8 miles downstream on a river in 20 minutes. It takes 30 minutes to go (answered by ankor@dixie-net.com)

A motorboat can go 12 miles downstream on a river in 20 minutes. It takes 30 minutes for... (answered by stanbon)

Please help me solve this problem: A motorboat can go 14 miles downstream on a river... (answered by mananth)

A motorboat can go 16 miles downstream on a river in 20 minutes. It takes 30 minutes for... (answered by josmiceli)

Leo swims at 2 miles per hour in still water. After he swims down a river a quarter of a... (answered by josgarithmetic,ankor@dixie-net.com,greenestamps)

What is the speed of a boat and a current, if a boat travels 48 miles downstream in three (answered by Maths68)