sentence1: If it takes Annie 15 minutes to fix the flat tire and Sam continues to ride during this time , how many minutes will it take Annie to catch up with Sam assuming that Annie resumes riding at 15 km per hour ?
sentence2: If it takes Annie less than 15 minutes to fix the flat tire and Sam continues to ride during this time , how many minutes will it take Annie to catch up with Sam assuming that Annie resumes riding at 15 km per hour ?