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GMAT Problem Solving (PS) | Re: Two water pumps, working simultaneously at their respective

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fast pump takes x hour
Slow pump takes 1.5x hour


1/x + 1/1.5x = 1/4

1/x = 1/4 - 1/1.5x

1/x = (1.5x - 4)/6x

6x = 1.5x^2 - 4x

10x = 1.5x^2

10 = 1.5x

x = 10/1.5 --> stop here during practice exam because it seems strange and you have a serious lack of confidenceImage

x = 20/3


can somebody confirm please ?? Image Image
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