The traffic light at three different signal points change after every 15 seconds, 30 seconds and...

The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7 : 20 : 15 hours, then they will change again simultaneously at (a) 7 : 28 : 00 hours (b) 7 : 27 : 45 hours (c) 7 : 27 : 30 hours (d) 7 : 27 : 50 hours

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds . If they start changing simultaneously at 8 a.m., after how much time will they change again simultaneously ?

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they all change simultaneously at 8 a.m . Then at what time will they again change simultanously ?

The traffic lights at three different road crossings change after every 48 seconds,72 seconds and 108 seconds respectively.If they change simultaneously at 7 a.m.,at what time will they change simultaneously again?

The traffic lights at three different road crossings change after 24 seconds, 36 seconds and 54 seconds, respectively. If they all change simultaneously at 10 : 15 : 00 AM, then at what time will they again change simultaneously ?

The traffic lights at three different road crossings change after 24 seconds, 36 seconds and 54 seconds respectively. If they all change simultaneously at 10:15 :00 AM, then at what time will they again change simultaneously?

Traffic light at three different road crossings change after every 48 sec, 72 sec and 108 sec respectively. If they all change simultaneously at 7:00:00 hours, then at what time will they again change simultaneously ?