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Answer: 2:50

6 hours = $\frac14$ of 24 hours

$\frac14$ of 10 "hours" = 2.5 "hours"

2.5 "hours" = 2 "hours" and 50 "minutes"


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