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CBSE Class 12-science Answered

Using a hose it takes 9 hours to fill a swimming pool. Using an irrigation pump it takes 3 hours. If both hose and pump were used together, how long will it take to fill the pool?
Asked by tv2000in | 24 May, 2019, 02:52: PM
answered-by-expert Expert Answer
the space hose space will space fill space 1 over 9 th space part space in space 1 space hour
Irrigation space pump space will space fill space 1 third th space part space in space one space hour
both space together space will space fill space open parentheses 1 third plus 1 over 9 close parentheses th space part space in space one space hour
rightwards double arrow 1 third plus 1 over 9
rightwards double arrow 3 over 9 plus 1 over 9
equals 4 over 9
so comma space it space will space take space 9 over 4 space equals 2.25 space hrs space for space both space of space it space to space fill space together
Answered by Arun | 24 May, 2019, 04:10: PM
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