In the magic land of Tease Your Mind, Mr. Wronged was trying to get back at his enemy. He was able to seize a bag of magic gunpowder to carry off the the fort of his enemy in an attempt to blow it up. He was unaware however, that the bag was leaky and that magic gunpowder had been leaking out since he seized it. He had been running at his usual speed of 14 kilometers per hour over the 28 kilometer distance to the fort, but he knew that he had to rest after such a long run. Meanwhile, the magic gunpowder was burning itself up at a rate of 12 kilometers per hour along the trail that he had left behind him. How long could he rest once he got the the enemy's fort?

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20 minutes.
He ran for two hours (28km / 14km/h)
The gunpowder started to burn as soon as he departed.
The gunpowder would burn for 2 hours and 20 minutes (28km / 12km/h)
So as he had ran for 2 hours, he only had 20 minutes before the gunpowder caught him up.

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