1 . It takes Rumi 15 minutes to inspect a machine and Sami needs 18 minutes to inspect a machine. They both start inspecting machines separetely at 9 : 00 A.M. At certain points of time both of them will finish inspecting a machine at the same time. When will this occure for the first time?

• A. 11 ; 30 A.M
• B. 10 : 45 A.M
• C. 10 : 30 A.M
• D. 1 : 00 A.M

Answer: Option C

Explanation: