Predict the result Use distance equals rate times time to solve for time. The source gives distance five hundred twenty and rate sixty-five. Which quantity should be isolated? Set up the model Divide by the rate when the rate is nonzero. The general formula is time equals distance divided by rate. Work the example Five hundred twenty divided by sixty-five is eight. The original product sixty-five times eight is five hundred twenty. So the stated time is eight. The quotient assumes a nonzero rate. Check the result Now solve for rate when distance is one hundred eighty and time is four, then state the general formula. Take eight seconds to think before the answer appears. [Eight-second silent pause to work; the answer remains hidden.] The rate is forty-five, and the general formula is distance divided by time when time is nonzero. If time is zero, check the original equation instead of dividing. Interpret the result A zero-factor equation can allow every rate or no rate, depending on the stated distance. Use the original task and check that your result fits its meaning.