Airport Engineering
In an airport, if 4 groups of 5 gates each located well separated are considered for traffic and the future to present traffic ratio is 3, then the total requirement of future gates will be

36
32
44
68

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Airport Engineering
Effective length of a runway is the distance between

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

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