The length of a runway under standard atmospheric conditions is 1800 m. If the actual reduced level of the site is 1200 m, the design length of the runway is

A. 78 m B. 150 m C. 300 m D. 450 m

A. Asphaltic concrete B. Rubberised tar concrete C. Plain concrete D. All the above

A. Ends of the runway B. Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway C. Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway D. Ends of the clear way on either side

A. 22.5 m × 22.5 m B. 30 m × 30 m C. 22.5 m × 30 m D. 60 m × 120 m