For a broad gauge railway track on a horizontal curve of radius $R$ (in m), the equilibrium cant $e$ required for a train moving at a speed of $V$ (in km per hour) is
1. $e= 1.676 \frac{V^2}{R}$
2. $e= 1.315 \frac{V^2}{R}$
3. $e= 0.80 \frac{V^2}{R}$
4. $e= 0.60 \frac{V^2}{R}$