Twelve minutes is how many tenths of an hour?

• A. 0.10 hour
• B. 0.15 hour
• C. 0.20 hour
• D. 0.25 hour

Answer: (C)

Think in tenths of an hour: one tenth of an hour is 6 minutes (60 minutes ÷ 10 = 6). Each 0.1 hour equals 6 minutes, so 12 minutes is two tenths of an hour. That gives 0.2 hours, which is written as 0.20 hour. Checking the other options shows they correspond to 6, 9, or 15 minutes, not 12.