Larry C. answered • 09/07/18

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Walking speed is 4.5 km/hr or .45/6 km/min. Driving speed is 30 km/hr or 0.5 km/min. If X is the number of minutes spent walking:

15 = 0.45X/6 + 0.5(16-X)

Solve for X and then the distance traveled by the car is 0.5(16-X)