Task: Question Answering
Input (English): Question: Three friends-whose walking rates are 1 ft./sec., 3ft./sec.,and 6ft./sec. start together walking in the same direction around a circular track that is 420 feet in circumference.After how many minutes are the three of them together again?

 Option A: 5 mins

 Option B: 10 mins

 Option C: 15 mins

 Option D: 3 mins

 Option E: 7 mins
Output (English): Option E