Pararescue Jumpers Leave the Helicopter When It Is Flying "10

Multiple Choice

Pararescue jumpers leave the helicopter when it is flying "10 and 10," meaning that the helicopter is 10 ft above the water and moving at a speed of 10 knots (1 knot = 1 nautical mi/h = 1.852 km/h) . The international system of units equivalent of "10 and 10" is

A) 3 and 5.
B) 3 and 19.
C) 10 and 19.
D) 30 and 31.
E) 30 and 37.