The rate at which the water drained from the hot tub in gallons per minute is shown. How many gallons of water were in the hot tub before it started to leak? So let's see what they have over here. So they've plotted time, or they've plotted gallons per minute versus time within minutes. And so we see here, this blue line, this is the rate at which water drained from the tub, rate at which water drained from the hot tub. So at minute zero, the water wasn't really draining from the hot tub, and then more, not just more drained, but the rate at which the water was draining increased. So 10 minutes into his bath, the water was draining at a gallon per minute, and then 20 minutes into his bath, water was draining at two gallons per minute.