a tank is filled by a pipe in 18 hours and emptied by another pipe in 12 hours . How long will it take to empty the full tank , if both the pipes are kept open simultaneously ?
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if both the pipes are opened together then it take in 1hr = 1/18 - 1/12
= 2 + 3 / 36
= 5/36
the tank is filled in \36/5
= 7.2
= 7 hour 2 min
= 2 + 3 / 36
= 5/36
the tank is filled in \36/5
= 7.2
= 7 hour 2 min
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