Initial velocity of John's car (V1) = 0 miles per hour Final velocity of John's car (V2) = 45 miles per hour Time taken for acceleration = 45 seconds Then Acceleration = (V2 - V1)/Time taken = (45 - 0)/15 miles per hour per second = 45/15 miles per hour per second = 3 miles per hour per second. So the approximate rate of change in the miles per hour that John's car accelerated is 3 miles per hour per second. The correct option among all the options given in the question is option "A".
