What is Knots?

Knot measures speed. This unit is used in meteorology, aviation and maritime. Its uses the symbol kt or kn and is equal to number of nautical mile per hour.

Knots can be calculated using following formula. Please note that $t$ is in hours

$$kn = \frac{x}{t}$$

or

$$1 kn = 1 \frac{nmi}{h} = 1.852 \frac{km}{h}$$

$kn$ - Knots $nmi$ - Nautical mile
$km$ - Kilometres
$x$ - Number of knots
$t$ - Time in hours

Wiki page for Knots Wiki page for Nautical Mile

What is Feet per minute?

Feet per minute measures speed. This unit of speed measures how many Feet traveled in one minute. This is part of British imperial and American customary units system. Commonly, express as ft/min.

Feet per minute can be calculated using following formula. Please note that $t$ is in minutes

$$\frac{ft}{min} = \frac{x}{t}$$

$ft$ - Feet
$x$ - Number of feet
$min$ - Minutes
$t$ - Time in minutes

Wiki page for Feet
Wiki page for Feet per second