Monday

April 21, 2014

April 21, 2014

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

**Related Questions**

Algebra I - Pump A, working alone, can fill a tank in 3 hours, and pump B can ...

Physical Science - When you do 100 J of work on the handle of a bicycle pump, ...

physics - In 37.0 s, a pump delivers 552 dm3 of oil into barrels on a platform ...

Physics - In 39.0 s, a pump delivers 549 dm3 of oil into barrels on a platform ...

algebra - Pump A can fill a swimming pool in 6 hours and pump B can fill the ...

physics - another thermo problem - A bicycle pump is a cylinder 20 cm long and 3...

Physics - Figure 18-46 shows a hydraulic lift operated by pumping fluid into the...

math - A pump brings underground water up to ground level. The water flow is ...

Algebra - One pump can drain the pool in 11 minutes. When a second pump is used...

Algebra - One pump can drain the pool in 11 minutes. When a second pump is used...