Question 1153927
<pre>
PUMP                 RATE in TANKS/MINUTES

One pump              3/x

Another pump          1/x

Combined             1/12
</pre>
{{{3/x+1/x=1/12}}}---------------solve.

-

{{{4/x=1/12}}}

{{{x/4=12/1}}}

{{{highlight(x=48)}}}-----------minutes for the "another pump" working alone

{{{highlight(16)}}}------------minutes for the "one pump" working alone