So we're going to get an answer when we solve for ds dt. That's miles per hour. But I encourage you, if you want to, to actually write out the units and see how they work out. And so this is going to be equal to 2 times s. Well, s is 1 mile, so it's just going to be 2 times ds dt, which is what we're trying to solve for. So what do we get here on the left-hand side? So 1.2 times negative 30, that's negative 36. 1 over 5 of 30 is 6.