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ICSE Class 9 Answered

Two pipes P and Q would fill a cistern in 24 hours and 34 hours respectively. if both pipes are opened together, find when the first pipe must be turned off so that the cistern may be just filled in 16 hours
Asked by Rp7350876 | 28 Mar, 2020, 06:20: PM
answered-by-expert Expert Answer
cistern space filled space by space straight P space in space 1 space hr equals 1 over 24 cistern space filled space by space straight Q space in space 1 space hr equals 1 over 34 together 1 over 24 plus 1 over 34 now space we space need space to space fill space cistern space in space 16 space hrs let space together space they space are space open space for space for space straight x space hrs space and space straight Q space is space kept space open space for space 16 minus straight x space hrs space to space complete space the space work open parentheses 1 over 24 plus 1 over 34 close parentheses cross times straight x plus 1 over 34 open parentheses 16 minus straight x close parentheses equals 1 straight x equals 12.71 space hrs after space 12.71 space hrs space we space need space to space close space straight P
Answered by Arun | 30 Mar, 2020, 11:38: AM

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ICSE 9 - Maths
in the adjoining figure x and y are midpoints of side ab and ac respectively of triangle ABC if BC is equals to 7 cm ab is equals to 8.4 cm and ac is equals to 7.4 CM then find the perimeter of trapezium xbc y
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ICSE 9 - Maths
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