The traffic lights change after every 60s,90s& 120s.If they all change simultaneously at 8.20am,then at what time they again change simultaneously.
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mujhe v nhi ata
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shubh1177:
First Find the LCM of 60,90,120 which is 30*2*3*2=360 sec and that is 6 min so all the light will change at 8:26
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