Question 974448
Empty rate is {{{(250/3)(gallons/hour)}}}.


Amount yet to drain or make empty, {{{400-250}}}, gallons, or 150 gallons.


Uniform Rates, {{{R*T=V}}} relating rate, time, volume.
{{{(250/3)t=150}}}


{{{t=150(3/250)}}}


{{{t=45/25=9/5=highlight(1&4/5)}}}
1 hour 48 minutes