Answer
To solve this we will first calculate the total time per distance of Sarah and Eva and compare it.
Sarah :
3/75 + 5/125 + 12/300 + 17/425 =
Using the simplification:
3/75 simplifying by 3 we get: 1/25
5/125 simplifying by 5 : 1/25
12/300 simplifying by 12 : 1/25
17/425 simplifying by 17 : 1/25
so 3/75 + 5/125 + 12/300 + 17/425 = 1/25 + 1/25 + 1/25 + 1/25 = 4/25
Eva :
2/52 + 7/182 + 10/260 + 20/520 =
Using the simplification:
2/52 simplifying by 2 we get: 1/26
7/182 simplifying by 7 : 1/26
10/260 simplifying by 10 : 1/26
20/520 simplifying by 20 : 1/26
so 2/52 + 7/182 + 10/260 + 20/520 = 1/26 + 1/26 + 1/26 + 1/26 = 4/26
As a final result Eva got 4/26 which means 4 minuts for 26 meters.
And Sarah got 4/25 which means 4 minuts for 25 meters.
Tha means Eva is faster then Sarah.
Simplifying Ratios
In this video, you learn how to simplify ratios.