See question above 11.5 km 9.5 km 9 km 9.7 km
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Since 
is representing the number of gallons of water in the tub, we need to replace with the number of gallons remaining in the tube to find the time. Fortunately, the problem is telling us just that: 17.8 gallons. The only thing left is replacing that value in the equation, and solve for 
to find the time:
We can conclude that after 3 minutes <span>the tub will have 17.8 gallons of water remaining.</span>
We can conclude that after 3 minutes <span>the tub will have 17.8 gallons of water remaining.</span>