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October 21, 2014

October 21, 2014

Posted by **Evan** on Wednesday, March 4, 2009 at 7:55pm.

- Math -
**Damon**, Wednesday, March 4, 2009 at 8:03pmI assume you mean

filled by cold and hot TOGETHER? in 4 min

emptied by drain in 5 min

pipes fill (1/4) tub per min

drain empties (1/5) tub per min

If all are on they fill 1/4 - 1/5

= 1/20 tub/min

(1/20) tub /min * t min = 1/2 tub

t = 20/2 = 10 min

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