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# How to use the formula for distance, rate (speed), and time to solve problems

This video lesson is an introduction to the formula for distance, constant speed, and time: d = vt (or d = rt if you use r as rate instead of v as velocity).

First I explain an easy way to memorize this formula in the form v = d/t, comparing it to the common way to express the speed of cars, such as 55 miles per hour. Then we solve a few simple problems involving distance, time, and speed using the formula.

Equations with fractions — video lesson

Math Mammoth Grade 7 curriculum (pre-algebra)

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