Question

the green light of a crossing goes of amd off. every 15 sec and that of the next crossing goes and off every 20sec .if they are lighted together at 4 am. when will the again go on together.कोई आंसर लिखकर मत भेज दो ​

Answer 1

Answer:

4:01 am

Step-by-step explanation:

they start together at 4 am

take LCM

15=5*3

20=5*2*2

60 sec=1 min