Question

Please explain....................

Answer 1

This is like a simple math problem. Let me explain. Here both the particles are revolving around the point O. Particle A takes 4s to complete one revolution. And particle B will take 4.5s to complete one revolution. So the LCM of 4 and 4.5 will give you the common time at which both the particles and the central point O are in the same line. So your answer is in the image!!!

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