Practice!

Sample Problem

In this lesson you will learn how to solve simple time problems. For these problems, all you need to remember is the formula D = rt and how it applies.

Colleen cycles 3 times as fast as she runs. If it takes her 42 minutes to run 5 miles, how long does it take her to cycle the same distance?

  minutes

Solution

Because her rate triples, her time decreases because the distance stays the same. So it takes her 42/3 = 14 minutes.