Question

the traffic light at three different crossing change after every 112 second, 168 second and 224 second, respectively. if they change simultaneously at 2 pm at what time will they change simultaneously again for the first time?​

Answer 1

Step-by-step explanation:

LCM OF 112 , 168 & 224 = 6384

HCF OF 112 , 168 & 224 = 14

6384 ÷ 14 = 456

456 ÷ 60 = 7.6

7 HOURS 6 MINUTES

2 PM + 7 HOURS 6 MINUTES

9:06 PM

9:06 they change simultaneously again for the first time