Two persons of equal height are carrying a long wooden beam of length l. They are at a distance $\frac{l}{4}$ and $\frac{l}{6}$ from the nearest end of the rod. The ratio of the normal reactions at their heads i s

Question

\[\begin {array} {1 1} (a)\;2:3 & \quad (b)\;1:3 \\ (c)\;4:3 & \quad  (d)\;1:2 \end {array}\]