40. Mary takes 2 medications throughout the day and night. One medication is to be taken every 6 hours and the other is to be taken every 4 hours. If Mary begins taking both medications at 7:00 A.M. and takes both medications on schedule, how many hours later will it be when she next takes both medications at the same time?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

The least common multiple of 4 and 6 is 12, so 12 hours after 7 o'clock, the medicine will be taken again at the same time.