SOLUTION: One crew can seal a parking lot in 15 hours and another in 20 hours. How long will it take to seal the parking lot if the two crews work together?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: One crew can seal a parking lot in 15 hours and another in 20 hours. How long will it take to seal the parking lot if the two crews work together?      Log On


   

Question 988536: One crew can seal a parking lot in 15 hours and another in 20 hours. How long will it take to seal the parking lot if the two crews work together?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
Simply add their RATES.

8 hours 4/7 hours
OR
8 hours 34 minutes