Answer to Question #100661 in Physics for danny

Question

In a 5.00 km race, one runner runs at a steady 12.0 km/h and another runs at 14.0 km/h .

Answer 1

How long does the faster runner have to wait at the finish line to see the slower runner cross?

$$t=\frac{d}{v_1}-\frac{d}{v_2}$$

$$t=\frac{5}{12}-\frac{5}{14}=0.06\ h=3.6\ min$$