Answer:

17.48 seconds

Step-by-step explanation:

What is asked? The time it took of the third member to finish 100 meters

Given: 56.42 seconds , 17.52 seconds, 21.42 seconds

Plan: Use Addition and Subtraction

Solution: 21.42 + 17.52 = 38.94s The total time of the first and second member (Jobern and Pedro)

Solution: 56.42 - 38.94 = 17.48s The time of the third member

Check: 38.94 + 17.48 = 56.42 seconds

#Brainliest

#CarryonLearning