Question
A race track is in the shape of a rectangle with length of 30 metres and area of 900 m2. A car takes 15 seconds to make one lap around the perimeter of this track. If the car and a person whose speed is 5 m/s, started moving at the same time along the perimeter of the track but in opposite directions, then find the distance between the car and the person, 3 seconds before they cross each other.
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