<PRE><B>Question 909520</B>
RT=V rate time volume;
T units of minutes and V units of POOL, the amount of pools.


The filling rate will be {{{1/15-1/24}}} POOLS per MINUTE when both pipes are open.  The pool is already {{{(1/4)}}}, so the situation is to fill {{{3/4}}} pool.


Let t be the time in minutes to fill {{{3/4}}} pool.


{{{highlight((1/15-1/24)t=3/4)}}}.
Solve for t.</PRE>