On a 1 mile track, Runner A has made 18 laps in the time it took Runner B to make 8 laps. If Runner A is running 5 mph faster than Runner B, how fast is each of them running?

Question

asked Apr 14, 2021 83.0k views

1 Answer

Kennesha · Answer 1 · 2021-04-18T01:45:27+0000

9514 1404 393

Answer:

Explanation:

Let b represent the speed of runner B. then the ratio of speeds is ...

b/(b+5) = 8/18

18b = 8(b +5) . . . . cross multiply

10b = 40 . . . . . . . . subtract 8b

b = 4 . . . . . . . . . . . divide by 10

Runner B's speed is 4 mph; runner A's speed is 5 mph more.

Runner A is running at 9 mph; Runner B is running at 4 mph.