A Man Smiles At Her Wife Every 3 Seconds While The Wife Smiles Back Every 6 Seconds. When Will Both

A man smiles at her wife every 3 seconds while the wife smiles back every 6 seconds. When will both husband and wife smile at each other at the same time?

Pls. Answer it properly

 

Answer:

ano yan e + bayan or ×,÷ paki ayos po