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To track a stolen car, the police are using a sophisticated computerized tracking system that uses a satellite to show the distance d in miles covered by the car in time t hours. The tracker produces a graph showing (2, 60) and (4, 100) as a pair of distance-time points in the format (t, d). What is the average speed of the car between the two points in miles per hour?

Respuesta :

The stolen car is tracked at these locations:
(2, 60) => 2 hours at distance 60 miles
(4, 100) => 4 hours at 100 miles

Time interval, T = 4 - 2 = 2 hours
Distance traveled, D = 100 - 60 = 40 miles.

Average speed = D/T = 40/2 = 20 miles/hour

Answer: 20 mph

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