To physics professors challenge each other to a 100 m race. Dr. Rice runs the race in 10.40 seconds. Dr. Lopez runs the first 25 m with an average speed of 10 m/s, the next 50 m with an average speed of 9.5 m/s, and the last 25 m with an average of 11.1 m/s. Who lost?

Explanation:

The time it took Dr Rice to finish the race has already bee provided as 10.40 seconds.

However for Dr Lopez, his overall average speed will have to be calculated as

(10 + 9.5 + 11.1)/3 = 10.2 m/s

To determine the time it took Dr Lopez, the formula for speed will be used

speed = distance/time

10.2 = 100/time

time = 100/10.2

time = 9.80 seconds

Hence, it took Dr Lopez 9.80 seconds to complete the 100 meters race and hence was the winner. Thus, Dr Rice lost for completing the 100 m race in 10.40 seconds

i think the answer is a, hope this is right, that would be my best guess.