Bunuel wrote:

Two cyclists are racing up a mountain at different constant rates. Cyclist A is now 50 meters ahead of cyclist B. How many minutes from now will cyclist A be 150 meters ahead of cyclist B?

(1) 5 minutes ago, cyclist A was 200 meters behind cyclist B.

(2) Cyclist A is moving 25% faster than cyclist B.

Statement II is insufficient. The ratio of speed is not very helpful when calculating the difference of speeds. My mindset moving to statement I is that there should be a temptation to choose C so I must be very careful.

Statement I is sufficient. The change of 250 meters over 5 minutes is the rate of change for both cyclist A and cyclist B.

IMO A