A river of width 200 m is flowing from west to east with a speed of 18 km/h. A boat, moving with speed of 36 km / h in still water, is made to travel…

A river of width $\displaystyle 200$ m is flowing from west to east with a speed of $\displaystyle 18$ km/h. A boat, moving with speed of $\displaystyle 36 \mathrm{~km} / \mathrm{h}$ in still water, is made to travel one-round trip (bank to bank of the river). Minimum time taken by the boat for this journey and also the displacement along the river bank are $\displaystyle \_\_\_\_$ and $\displaystyle \_\_\_\_$ respectively.