Utet Apr 15 Paper1 Q#107

0. The traffic lights of three cross roads change after each 1 min, 75 sand 90 s respectively. If these lights change simultaneously at 7 : 50 am, then they will change simultaneously again at

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Option : C
Explanation : LCM of 60,75 and 90 =900 s = 900/60 =15 mm Then, the light will change simultaneously again at 7: 50 + 15 min = 8: 05 am

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