Question

Traffic light at one particular crossing changes after every 40 seconds. The Traffic light at the next cross- ing changes after every 32 seconds. At a certain time they change together. After what time will they again change together?​

Answer 1

Answer:

The traffic light at one particular crossing change every 40 seconds. The traffic light at the next crossing changes every 32 seconds. The time required to change together is equal to the least common multiplier of both times. Required time = LCM (40, 32) = 160 sec = 2 min.