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[" 15.Two pipes "A" and "B" can fill a cistern in "6" minutes and "7" minutes respectively."],[" Both the pipes are opened alternatively for "1" minute each.In what time will "],[" they fill the cistern? "],[[" (a) "5" minutes "," (b) "5(2)/(3)" minutes "," (c) "6(3)/(7)" minutes "," (d) "1(1)/(4)" minutes "]]

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