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Mathematics word problem

Mathematics
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Math Problem: there are 3 pumps that fill a pool the first pump can fill the pool in 3 hours the second pump can fill the pull in 4 hours and the 3rd can fill the pool in 6 hours how long would it take to fill the pool if all 3 pumps are running at the same time

Apr 8th, 2015

in 1 hour,

pump A does 1/3 of job

pump B does 1/4 of job

pump c does 1/6 of job

so in 1 hour, job done= 1/3+1/4+1/6= 9/12

total job= 12/12 is done in;

time= 12/9 hours= 1 hour 20 minutes........................................please best me

Apr 8th, 2015

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Apr 8th, 2015
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Apr 8th, 2015
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