On Ashok Marg three consecutive traffic lights change after 36, 42 and 72 seconds respectively. If the lights are first switched on at 9:00 A.M. sharp, at what time will they change simultaneously?

 

  • Option 1)

     

    9 : 08 : 04

     

  • Option 2)

     

    9 : 08 : 24

     

  • Option 3)

     

    9 : 08 : 44

     

  • Option 4)

     

    None\: of\: these

     

  • Option 5)

     

    -

     

Answers (1)

LCM of 36, 42, 72 = 504 seconds or 8 min 24 seconds

Required Time = 9:00 + 8 min 24 seconds

                           = 9: 08: 24

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