20. Every 10 minutes, Channel 7 begins a 60-second-long commercial. Every 12 minutes, Channel 5 begins a 60-second-long commercial. Each channel began a 60-second-long commercial at the same instant. How many minutes will elapse before both channels next begin a 60-second-long commercial at the same instant?

Answer and Explanation

Your Answer is

Correct Answer is K

Explanation

After adding the advertisement according to the title, the time will be extended to the advertisement time, which is 60 seconds, choose K