Two plane mirrors of length L are separated by distance L and a man \[{{M}_{2}}\] is standing at distance L from the connecting line of mirrors as shown in figure. A man \[{{M}_{1}}\] is walking in a straight line at distance 2L parallel to mirrors at speed u, then man \[{{M}_{2}}\] at O will be able to see image of \[{{M}_{1}}\] for time:

• A. \[\frac{4L}{u}\]
• B. \[\frac{3L}{u}\]
• C. \[\frac{6L}{u}\]
• D. \[\frac{9L}{u}\]