In mountainous regions, railway curves are designed to ensure the safety and comfort of passengers. The maximum degree of curvature refers to the sharpest curve that can be used safely in such regions.
According to standard engineering practices for railways, the maximum allowable curve degree in mountainous regions is typically 40°.
Thus, the correct answer is option (D).
After applying the correction for elevation and temperature, the runway length is 700 m.
The corrected runway length (in m) for an effective gradient of 1% is __________ (round off to the nearest integer).
Consider a five-digit number PQRST that has distinct digits P, Q, R, S, and T, and satisfies the following conditions:
1. \( P<Q \)
2. \( S>P>T \)
3. \( R<T \)
If integers 1 through 5 are used to construct such a number, the value of P is:



