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Answer: 9:45 am

12 miles at 4 mph takes 3 hours.
12 miles at 8 mph takes 1.5 hours.
Harriet should set off 1 hour 30 minutes after Turbo, that is at 9:45am.


This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.