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three pipes a b and c can fill a tank in 6 hours. after working at it together for 2 hours c is closed and a and b can fill it in 7 hours. the number of hours takes by c alone to fill the cistern is - |
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Answer» LET A& B together take time = X hrs C TAKES time=y hrs 1/x+1/y=1/6 2/x+2/y=7/x 2/y=5/x x=5y/2 2/5y+1/y=1/6 7/5 y=1/6 y=42/5 DAYS |
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