SOLUTION: A swimmming pool can be filled up by pipes A and B in 3 hours and 35 minutes. If pipe A can fill the pool in 6 1/2 hours, how long can pipe B fill it alone?

Question 571266: A swimmming pool can be filled up by pipes A and B in 3 hours and 35 minutes. If pipe A can fill the pool in 6 1/2 hours, how long can pipe B fill it alone?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
A swimmming pool can be filled up by pipes A and B in 3 hours and 35 minutes. If pipe A can fill the pool in 6 1/2 hours, how long can pipe B fill it alone?
**
3hrs and 35 min=215 min
6 1/2 hrs=390 min
let x=minutes pipe B can fill the pool alone
..
sum of individual work rates=work rate working together
1/390+1/x=1/215
1/x=1/215-1/390
1/x=(390-215)/215*390=
1/x=175/83850
x≈479 min
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