SOLUTION: a town's old street sweeper can clean the streets in 60 h. the old sweeper together with the new sweeper can clean the streeats in 15 h. how long would it take the new sweeper to

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Question 170298This question is from textbook algebra and trigonemetry structure and method book 2
: a town's old street sweeper can clean the streets in 60 h. the old sweeper together with the new sweeper can clean the streeats in 15 h. how long would it take the new sweeper to do the job alone? This question is from textbook algebra and trigonemetry structure and method book 2

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
60x/(60+x)=15
60x=15(60+x)
60x=900+15x
60x-15x=900
45x=900
x=900/45
x=20 hours for the new sweeper working alone.
Proof:
60*20/(60+20)=15
1200/80=15
15=15