SOLUTION: Easy answers for this... how to figure it out One window washer working alone can wash the windows of a certain building in 15 hours. His partner can do the job in only 10 hours

Question 372716: Easy answers for this... how to figure it out
One window washer working alone can wash the windows of a certain building in 15 hours. His partner can do the job in only 10 hours. To the nearest half-hour, how many hours would they need to do the job working together?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi,

Let x represent time it would take together

Per hour is the Equalizer

1/15 + 1/10 = 1/x  Multiplying each term by 30x so as all denominators = 1

2x + 3x = 30

5x = 30

x = 6hrs, the time it would take together

 

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