An empty tank is filled by the first tap in 40 minutes and the full tank is emptied by the second tap in 30 minutes. When the tank is full the second tap is opened. The first tap is opened 5 minutes after it. How long will it take to empty the tank?
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Answer:
120min=2hours.
Step-by-step explanation:
In 1 min the second tap emtied 1/30part of the total tank.
In 1 min the first tap can fill 1/40part of the total tank.
In 1 min the net loss of water=1/30-1/40=1/120[You have to do the calculation]
Therefore it will take 1/1/120=120min=2 hours to empty.
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