SOLUTION: Pony starts 3 hr before horse. Horse catches pony after 6 hrs. horse speed 18km/hr find pony’s speed?

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Question 335582: Pony starts 3 hr before horse. Horse catches pony after 6 hrs. horse speed 18km/hr find pony’s speed?
Found 2 solutions by stanbon, dazybeans:
Answer by stanbon(75887) About Me  (Show Source):
Answer by dazybeans(1) About Me  (Show Source):
You can put this solution on YOUR website!
speed of pony=x kmph
distance travelled= 3x
horse speed=18 kmph
difference=18-x kmph
6=3x/18-x
x=12 kmph