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
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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
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