1 hour equals which of the following statements?

• A. 60 minutes, 120 seconds
• B. 2 hours, 7200 seconds
• C. 120 minutes, 3600 seconds
• D. 60 minutes, 3600 seconds

Answer: (D)

Time unit conversions. An hour is defined as 60 minutes, and a minute is 60 seconds, so 1 hour equals 60 × 60 seconds, which is 3600 seconds. Therefore, 1 hour can be described as 60 minutes or as 3600 seconds, and the statement that lists both of these equal expressions is correct. The other options describe either a different duration or an inconsistent pairing—for example, 2 hours equals 120 minutes and 7200 seconds, which is not 1 hour, and pairing 60 minutes with 120 seconds would imply a much shorter duration than an hour.