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5001Je
18.07.2019 •
Mathematics
John can paint a fence in 9 hours. tim can paint the same fence in 11 hours. how much time would the two working together need to paint the same fence? (round your answer to the nearest hundredth.)
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Ответ:
John can paint a fence in 9 hours
so
100%> 9 hours
X> 1 hour
x=100/9> 11.11%
that means that in 1 hour john paint 11.11% of the fence
Tim can paint a fence in 11 hours
so
100%> 11 hours
X> 1 hour
x=100/11> 9.09%
that means that in 1 hour Tim paint 9.09% of the fence
John and Tim in 1 hour can paint (11.11%+9.09%)> 20.2 %
so
20.2%> 1 hour
100%> X
x=100/20.2> x=4.95 hours
the answer is
4.95 hours
Ответ: