Question

5.The traffic lights at three different road crossings change after every 48 sec; 72 sec; and 108 sec., respectively. If they all change simultaneously at 8:20:00 hrs, then they will again change simultaneously at .
a. 8:27:12 Hrs
b. 8:27:24 Hrs
c. 8:27:36 Hrs
d. 8:27:48 Hrs

Answer 1

B 8:27:24Hrs

Step-by-step explanation:

LCM of 72,108 and 48 is 432

432/60=7.24

so, the answer is 8:27:24