Answer:
Ruby, Summer, Caitlin, Lydia
Step-by-step explanation:
Let's look at the given information:
Let's start by determining the places of Summer and Caitlin.
Caitlin finishes before Lydia and after Summer, meaning that she can't be last place.
This means Caitlin is either second or third place. We also know Caitlin finishes after Summer, meaning that Summer has to be in first or second place.
But, Ruby also finishes Summer, meaning that she must have finished first. We can use this to find the place of all the other girls...
Ruby, Summer, Caitlin, Lydia