SOLUTION: Cleaning service number 1 can clean a certain office building in 30 hours, while the cleaning service number 2 can clean the same building in 20 hours. If the two companies work t

Question 292396: Cleaning service number 1 can clean a certain office building in 30 hours, while the cleaning service number 2 can clean the same building in 20 hours. If the two companies work together, how long would it take to clean the building?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
This is indeed a word problem. How did you decide that it is travel and distance word problem?
x/30+x/20=1
2x+3x=60
5x=60
x=12
Together the two companies can do the job in 12 hours.
check
12/30+12/20=1
2/5+3/5=1
ok

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