Calculate the opposite direction of the runway 13.

Runways are named by a number between 01 and 36, which is generally one-tenth of the azimuth of the runway's heading in degrees: a runway numbered 09 points east (90°), runway 18 is south (180°), runway 27 points west (270°) and runway 36 to the north (360° rather than 0°).

A runway can normally be used in both directions and is named for each direction separately.

Correct answer:

x =  31

Step-by-step explanation:

x=10(130+180)mod360=10310mod360 x=31

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