Question 1065102
Rate unit is  {{{TANK/MINUTES}}}.


Rate for both taps open is the sum of their rates.
{{{1/30+1/90}}}

{{{3/30+1/90}}}

{{{4/90}}}

{{{2/45}}}


The time in minutes to fill the one tank is {{{45/2=22&1/2}}} minutes.