Ryan and his twin brother Caleb just finished soccer practice. They decide to race home. Caleb brought his skateboard, but Ryan left his at home. So, Ryan gets a 1-minute head start to run home. If Ryan runs at a rate of 7.5 miles per hour and Caleb rides his skateboard at a rate of 9.5 miles per hour, how long will it take Caleb to catch up to Ryan?