Final answer:
John Ross completed the 40-yard dash in approximately 4.22 seconds, calculated by dividing the distance of 40 yards by his average speed of 9.48 yards/second.
Step-by-step explanation:
The student asked how long did it take John Ross to complete the 40-yard dash at the NFL combine if he ran at an average speed of 9.48 yards/second. To calculate the time it took for John Ross to finish the race, we can divide the distance by the average speed. The distance of the race is 40 yards, and the average speed is 9.48 yards/second. To calculate the time taken for John Ross to finish the 40-yard dash, we can use the formula time = distance / speed. So, the calculation would be time = 40 yards / 9.48 yards/second, which equals approximately 4.22 seconds.
Therefore, the answer to the student's question is: a) The time taken is 4.22 seconds.