Question

How long will it take a runner to run 15km if the runner can maintain an average speed of 5m/s?

Answer 1

We can find the time that the runner takes to run 15 km from the formula:

$$t=\dfrac{s}{v}=\dfrac{15000\ m}{5\ \dfrac{m}{s}}=3000\ s=50\ min.$$

Answer:

$t=3000\ s=50\ min.$