Question

the traffic signal lights at three different crossings of road change at every 16sec,28sec and 40 sec respectively. of the signal lights changed together at 8a.m in morning ,lets find when will the three signal lights changed together again​

Answer 1

Answer:

firstly find the LCM of 16,28 and 40

Step-by-step explanation:

the LCM of 16,28and40 is 560 sec and he asking that how much time he take to changed together so we change 560sec into minute answer is 9min20sec and add 9min20sec +8am 17:20 it means 5:20pm

so the answer is they changed together at 5:20pm