All the vehicles that come during a particular peak hour come during a 10-minute period within this hour. The 15 -minute peak hour factor for this peak hour is

The maximum degree of the curve that can be used for railways in a mountainous region is

Road A and Road B are joined by a circular horizontal curve of radius 200 m as shown in the figure. Road $A$ and Road $B$ are tangential to the curve at the points $C$ and $D$, respectively. Had the curve not been there, straight roads $A$ and $B$ would have met at the point $E$. The distance from $C$ to $E$ is 92 m . The value of angle $\theta$ (in degrees) is

__________ (rounded off to 1 decimal place).

Note: The value of angle .. is to be calculated only from the consideration of Euclidean geometry and the data given in the problem.

The speed-density relation on a one-way, single lane road is shown in the figure, where speed $u$ is in km/hour and density $k$ is in vehicles/km. The maximum flow (in vehicles/hour) on this road is