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A tourist being chased by an angry bear is running in a straight line toward his...

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.6 m/s. The car is a distance d away. The bear is 27 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

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