12,726 feet per 18.75 minutes = 12,726/18.75 =
678.72 feet per minute
a knot = 1.852 kilometres per hour (exactly) =
1,852 meters per hour =
30.8666666667 meters / minute
1 foot = 0.3048 meters exactly
1 knot = 30.8666666667 / .3048 = 101.2685914262 feet / minute
=678.72 ft min/ 101.2685914262 ft min =
6.7021767603 knots
6.7022 knots (rounded)