Telegraphic poles along a straight railway track are spaced at regular intervals of $90\;m$. A passenger in the train observes the successive pole pass at time intervals of 3 and 2 seconds respectively , find the acceleration of the train assuming it to be uniform .

Question

$\begin{array}{1 1} (A)\;6ms^{-2} \\(B)\;8\;ms^{-2} \\(C)\;7\;ms^{-2} \\(D)\;9\;ms^{-2} \end{array}$