Final answer:
To calculate the average speed in miles per hour, divide the distance by the time converted to hours. To calculate the average speed in feet per second, multiply the distance in miles by a conversion factor and divide by the time converted to minutes and then to seconds.
Step-by-step explanation:
The average speed can be calculated by dividing the distance by the time. In this case, the distance is given in miles and the time is given in minutes. To convert the time to hours, we divide by 60. So, the average speed in miles per hour is given by option (a) Speed in miles per hour: Distance/Time=Miles/(14/60) = Miles/14/60.
To convert the average speed to feet per second, we multiply the distance in miles by 5280 (the number of feet in a mile) and divide by the time in minutes multiplied by 60 (the number of seconds in a minute). So, the average speed in feet per second is given by option (d) Speed in feet per second: Distance×5280/(14x60).