Russell left the party early traveling 7 mph. 3 hours later, Crystal decided to head out and catch up with him. She ran 8 mph. How long would she have to run to catch up with him?

Answer 1

Russel's distance after 3 hours was 7 x 3 = 21 miles

lLetting time = 0 is the point when Crystal starts then we are looking to find when the distances are equal starting at time (t) = 0.

So, 21 + 7t = 8t or t = 21 hours

(Russel) (Crystal)