Slow-running watch

Algebra Level 3

After going scuba-diving, Mei's watch (which was not water-resistant) started to run slower. By comparing to a clock on the wall, she realized that her watch was now running slow. In fact, for each minute that passed in real time, her watch got further behind by 10 seconds.

She tried to time the bus trip back to the resort. According to her watch, she boarded the bus at 10:00:00 AM, and reached the resort at 10:10:30 AM. How much time (in seconds) did the bus trip actually take?

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