Question

Kiran is the fastest runner in our school. (Begin: No other......)​

Answer 1

no other runner in our school can run as fast as kiran

Answer 2

No other student in the school can compete with Kiran in running. No other candidate can run as fast as Kiran in the school. In both the sentence the running potential of Kiran is being highlighted.

The sentence talks about how well she can run and how fast she can move on the track. from the sentence you can learn how good Kiran is as a runner.