Convert nautical mile per hour to second per kilometer

The nautical mile is 1,852 m, defined so that it matches one minute of latitude: a degree of latitude is 60 nautical miles, which lets a navigator read distances straight off the edge of a chart. The knot is one nautical mile per hour, 1.852 km/h, and is the standard speed unit at sea, in the air and in weather reports. A gale, force 8 on the Beaufort scale, begins at 34 knots.

Runners think in pace, minutes per kilometre or per mile, which is the reciprocal of speed: 5:00 min/km is 12 km/h, 6:00 min/km is 10 km/h, and 8:00 min/mile is 12.1 km/h. A 4-hour marathon needs 5:41 min/km, a 25-minute 5 km 5:00 min/km. Swimmers use seconds per 100 m; treadmills usually display km/h or mph, so the conversion comes up on every gym visit. Note that pace is the only unit here where a smaller number means faster.