It takes 20 minutes for John to go to the bathroom 8 times. How long would it take to go 6 times? Think carefully first, then make a decision:
User
He spends 20 / 8 = 2.5 minutes each time he goes in. So it would take 2.5 * 6 = 15 minutes to go 6 times. So, the answer is 15.
Assistant