Question

Beginning at 10:30 A.M., tours of the National Capitol and the White House begin at a

tour agency. Tours for the National Capitol leave every 12 minutes. Tours for the White
House leave every 15 minutes. How often do the tours leave at the same time? What
time will it be the next time that they leave at the same time?
What's the sender

Answer 1

The least common multiple of 12 and 15 is 60. Every hour the tours leave at the same time.

The tours will leave at the same time at 11:30, 12:30, ...