A bullet with a speed of $c=60 \frac{\mathrm{km}}{\text { hour }}$ was fired at a moving train, perpendicular to its direction. The bullet pierced a window pane on both sides of the train. How do these two holes lie relative to each other, if the bullet's speed was $c^{\prime}=40 \frac{\mathrm{m}}{\mathrm{sec}}$ and the width of the train was $a=4 \mathrm{~m}$?
The second arrow will be $a \frac{c}{c^{\prime}}=\frac{5}{3} \mathrm{~m}$ further back.