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April 18, 2015

April 18, 2015

Posted by **Randy** on Thursday, January 31, 2013 at 11:51pm.

- math -
**Reiny**, Thursday, January 31, 2013 at 11:59pmrate of pump A = 1/6

rate of pump B = 1/x

combined rate = 1/6 + 1/x

= (x+6)/(6x)

time at combined rate = 1/( (x+6)/6x )

= 6x/(x+6)

but 6x/(x+6) = 4

6x = 4x+ 24

2x = 24

x = 12

Pump B alone would take 12 hours

check:

combinedrate =1/12 + 1/6 = 3/13 = 1/4

time at combined rate = 1/(1/4)) = 4

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