Two pipes a andb can gil a tank in 36 min. And 45 min. Respectively. A water pipe c can emptythe tank in 30 min. First a and b are opened. After 7 minutes, c is alsoopened. In how much time, the tank is full ?
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(A + B)'s 7 minutes filling =(5+4)×7=63 units
Remaining capacity =180−63=117 units
Now C is opened, it empties by 6 units/min.
So total units filled in tank is =(5+4)−6=3 units/min
Now tank can be filled in =1173=39min
Tank is filled up in = 7+39 minutes=46 min
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