You've told us nothing about the direction, so we have no way to describe
the velocity. All we can work with is the speed.
The speed is exactly 50 km per 2.5 hours.
We'll convert that into other units with which you may be more familiar:
-- 20 km per hour
-- 5 and 5/9 meters per second
-- 12.427 miles per hour
-- 18.227 feet per second
-- 33,404.9 furlongs per fortnight
(the last 3 figures are rounded)
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The resultant velocity of a plane is 125 km/hr.
All you must do here is multiply the 1200 km by the number of hours, here 2.5. The plane went 3000 km.
1 hour, 50 minutes, 46.15 seconds
The average during that period of time is 20 km/hour west .
150 km per hour due East (or even -150 km per hour due West).