Question

In a 5.00 km race, one runner runs at a steady 11.8 km/h and another runs at 14.7 km/h .
How long does the faster runner have to wait at the finish line to see the slower runner cross?

Answer 1

5.02

Answer 2

Faster runner:
d = V*t = 5.0 km.
14.7*t = 5.
t = 0.340 h.

Slower runner:
11.8*t = 5.0
t = 0.424 h.

T = 0.424 - 0.340 = 0.0837 h = 5.02 min.
= Wait time.