SOLUTION: pump A can do a job in 42 mins and pump B can do a job in 35 mins. how long if both pumps are used.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: pump A can do a job in 42 mins and pump B can do a job in 35 mins. how long if both pumps are used.      Log On


   

Question 283680: pump A can do a job in 42 mins and pump B can do a job in 35 mins. how long if both pumps are used.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
x/42+x/35=1
x/6+x/5=7
5x+6x=210
11x=210
x=210/11 =19 minutes and about 1 second.