Which is correct?

Given 240 kph (240 kilometres per hour) = 149 mph (149 miles per hour)

How does one say this?

-240 kph equal 149 mph.
-240 kph equals 149 mph.
-240 kph is equal to 149 mph.
-240 kph are 149 mph.

Is 240 kph singular or plural (kilometre or kilometres)?
Or 240 kph is a separate kind of thing?