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Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is

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Work done by the waste pipe in 1 minute = 1/15-(1/20+1/24)
= -1/40[-ve means emptying]
so, volume of 1/40 part =3 gallons
volume of whole = 3*40=120 gallons
12 years agoHelpfull: Yes(4) No(2)

Let as take a, b, c;
a fills 20 min
b fills 24 min
a,b,c fills in 15 mins.
like
a-----------------20
b-----------------24
a+b+c-----------15
take L C M to 20,24,15 =120
that is the total capacity of the tank; Ans=120.
7 years agoHelpfull: Yes(2) No(2)

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