Answer-There are two pipes to fill a tank. Together, they can fill the tank in 15 minutes. If one pipe can...

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Let the slower pipe fill the tank in x minutes.  The faster pipe fills it in 2x3 minutes since its 1.5 times faster. Their combined rate is 1x  32x  115  52x  115  x  37.5 mins slower pipe The faster pipe takes 23 x 37.5  25 mins

There are two pipes to fill a tank. Together, they can fill the tank in 15 minutes. If one pipe can fill the tank in one and a half times as fast as the other, the faster pipe alone can fill the tank in:

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