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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. 11 ; 30 A.M
  • C. 11 ; 30 A.M
  • D. 11 ; 30 A.M

Answer: Option C

Explanation:

LCM of 15 & 18 are 90

Here 90 minutes = 1 hour 30 minutes

So, inspecting machine at the same time will be = 9:00 AM + 1 hour 30 minutes 

                                                                                                  = 10:30 AM (Ans)

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