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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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CBSE 12-science - Maths
if a, b, c are positive real number then
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Asked by shravankumar181131 | 30 Sep, 2023, 10:38: PM
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CBSE 12-science - Maths
X+y+4z=6 X+2y-2z=6 λx+y+z=6  How do you find the value of λ?
Asked by tejaswinimogal12 | 26 Sep, 2023, 08:17: AM
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CBSE 12-science - Maths
solve it
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Asked by sdmbotch1123 | 23 Sep, 2023, 06:51: PM
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CBSE 12-science - Maths
solve it.
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Asked by sdmbotch1123 | 19 Sep, 2023, 01:53: PM
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CBSE 12-science - Maths
solve it
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Asked by sdmbotch1123 | 19 Sep, 2023, 01:53: PM
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CBSE 12-science - Maths
six balls commence tolling together and toll at intervals of 2,4,6,8,10,12 seconds respectively. in 30 minutes how many times do they toll together.
Asked by gn1221007.19 | 18 Sep, 2023, 12:22: AM
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CBSE 12-science - Maths
find the particular solution
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Asked by pranavmishra1108 | 17 Sep, 2023, 11:12: AM
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CBSE 12-science - Maths
Solve please 
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Asked by sonkarmukesh007 | 13 Aug, 2023, 08:32: PM
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CBSE 12-science - Maths
Two dealers P and Q sell three items viz . , notebooks , pencils and erasers . In the month of April , the dealer P sells 250 notebooks , 400 pencils and 300 erasers , whereas the dealer Q sells 350 notebooks , 500 pencils and 470 erasers . In the month of may the dealer P sells 380 notebooks , 440 pencils and 360 erasers , whereas the dealer Q sells 450 notebooks , 520 pencils and 420 erasers.Using matrices represent The combined sale of two months for each dealer in each item ? ( i ) ( ii ) The change in sales from April to may for each dealer in each item ?
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Asked by sanjuchoudhury8600 | 06 Jul, 2023, 04:23: AM
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CBSE 12-science - Maths
 If B is coded =4 and D is coded 8 , E is coded 10 then what will be code of J
Asked by iamujjy | 21 May, 2023, 04:55: PM
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