Because the benzyl alchohol is more non-polar than being polar. yes it has OH but has lots of CH3-s and they are nonpolar nonpolarity is stronger so it is soluble in ether rather than in water. in chemistry polar in polar and non-polar to nonpolar is soluble. the water is polar
All you have to do is the inverse operation so that you multiply by "t" and it will be on the side with the "v" then you divide the v and it will be under the "d" so time = distance/ velocity (speed)