SOLUTION: A company has two large computers. The slower computer can send all the company's email in 30 minutes. The faster computer can complete the same job in 20 minutes. If both computer

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A company has two large computers. The slower computer can send all the company's email in 30 minutes. The faster computer can complete the same job in 20 minutes. If both computer      Log On


   

Question 1136431: A company has two large computers. The slower computer can send all the company's email in 30 minutes. The faster computer can complete the same job in 20 minutes. If both computers are working together, how long will it take them to do the job?
Found 2 solutions by josgarithmetic, josmiceli:
Answer by josgarithmetic(39620) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +t+ = time for then working together
Add their rates of working
+1%2F30+%2B+1%2F20+=+1%2Ft+
Multiply both sides by +60t+
+2t+%2B+3t+=+60+
+5t+=+60+
+t+=+12+ min
12 min working together