Speed Ratio Problem

Question

Chris and Goffy ran from Newton to Boston at 15 km/h and 12 km/h respectively. They both started from Newton at 10:00 a.m. If Goffy reached Boston at 10:30 a.m., at what time did Chris reach Boston?

Answer 1

distance=rate*time

d=r*t

d=12*(1/2)

d=6 kilometers from Newton to Boston

6=15*t

t=6/15=2/5 of an hour or 24 minutes

Chris reached Boston at 10:24 a.m.