Question 761436
Your are correct on your calculation for the volume of the tank.
Now divide the 22.1ft^3 by the rate of the gas pump.
{{{(22.1cross(ft^3)/1) * (1minute/5cross(ft^3)) = 4.42minutes}}}

Since 0.42 is less than 0.5 you would normally round down. But I think since the tank is not yet full at 4 minutes, that you should round up to 5.