Question

Hunter leaves his house to go on a bike ride. He starts at a speed of 15 km/hr. Hunter's
brother decides to join Hunter and leaves the house 30 minutes after him at a speed of
18 km/hr. How long will it take to Hunter's brother to catch up to him?

Answer 1

30 minutes = 0.5 hour

15x = 18(x - 0.5)
15x = 18x - 9
-3x = -9
x = 3 hours

Check:
Hunter = 15(3) = 45 miles
Brother = 18(2.5) = 45 miles