Filling a TankDate: 08/01/97 at 20:14:14 From: EVAN Subject: Filling a Tank If one pipe can fill a tank in 1 1/2 hours, and another can fill the same tank in 45 minutes, how long will it take the two pipes to fill the tank together? Date: 08/07/97 at 15:37:16 From: Doctor Rob Subject: Re: Filling a Tank This is a common type of problem given in algebra classes. Think about the part of the tank the first pipe can fill in one minute. That would be 1/90 of the tank. Now think about the part of the tank the second pipe can fill in a minute: 1/45 of the tank. Working together, both pipes can fill 1/90 + 1/45 of the tank in one minute. Let T be the number of minutes to fill the whole tank together. Then T*(1/90 + 1/45) = 1 tankful. Now solve for T. All problems of this type can usually be solved by a similar technique. -Doctor Rob, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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