Question 1046165: Diana left the coffee shop traveling 6 mph. Then, 3 hours later, Chelsea left traveling the same direction at 12 mph. How long until Chelsea catches up with Diana?
Answer by josgarithmetic(39625)   (Show Source):
You can put this solution on YOUR website! UNKNOWN:
t, time for Chelsea's travel to catchup
d, catch-up distance
KNOWN:
R=12 mph
r=6 mph
h=3, for "three hours later"
speed time distance
Dianna r t+h d
Chelsea R t d
The question basically asks for t.
Travel Rate rule is RT=D to relate RATE, TIME, DISTANCE;
You will only need to form one equation because d is the same value for Dianna and for Chelsea - the catchup distance.
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