word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

two pumps were required to pump the water out of the submerged area after the hurricane. pump a, the larger of the two pumps, can pump the  water out in 27 hours, whereas it would take pump b 135 hours. both pumps were working for the first 9 hours until pump a broke down. how long did it take pump b to pump out the remaining water?

May 18th, 2015

out of 27 full hours pump a worked 9 hours mean 1/3 of total and pump b worked for 9 hours

So 

time require pump b for remaining water= (135/3)-9

=45-9

=36 hours


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Best of luck

May 18th, 2015

wrong

May 18th, 2015

How ???????

May 19th, 2015

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