A train left the station at uniform acceleration of 2 m / s^2. A man behind the train at a distance of 5 m is running with a constant speed of 6 m/s…

A train left the station at uniform acceleration of $\displaystyle 2 \mathrm{~m} / \mathrm{s}^2$. A man behind the train at a distance of $\displaystyle 5$ m is running with a constant speed of $\displaystyle 6$ m/s to catch the train. The time to catch the train will be \_\_\_\_ s.