How far east will the plane travel in 1 hour?

Let Vpa be the velocity of plane with respect to air and Vp and Va be the velocities of plane and air respectively with respect to ground.

Vpa = Vp - Va

Vp = Vpa + Va [all these quantities are vectors]

so by parallelogram law of vector addition

Vp = (Va^2 + Vpa^2 + 2*Va*Vpa*cos120) ^ (1/2)

Vp^2 = 33^2 + 140^2 - 33*140

Vp^2 = 16096

Vp = 126.763m/s

(2) tan b = (33*sin120) / (140+33/2)

b = 10.34 degrees North of East

(3) component of velocity of plane in east = Vp cos (10.34) = 126.763*1 = 126.7m/s

distance travelled by plane in east = 126.7 * 60*60=456120 m