What is the equivalent of 4°36' in time units?

Correct Answer: Option D — 18 min. 24 sec.

Converting arc to time uses the standard rate of 15 degrees per hour, 1 degree per 4 minutes, and 1 minute of arc per 4 seconds. Multiplying 4 degrees by 4 minutes yields 16 minutes, and 36 minutes of arc by 4 seconds yields 144 seconds (2 minutes 24 seconds), totaling 18 minutes 24 seconds.