Answer:
Horizontal component of velocity = 241.61 m/s
Explanation:
Given that,
Velocity of a jetliner is 245 m/s
The vertical component of the plane's velocity is 40.6 m/s, 
We need to find the magnitude of the horizontal component of the plane velocity.
The resultant velocity is given by :

Where,
is the horizontal component of the plane velocity

So, the magnitude of the horizontal component of the plane velocity is 241.61 m/s.