Physics
posted by bubba .
a plane travels 1.3 km at an angle of 28 degrees to the ground, then changes direction and travels 6.8 km at an angle of 20 degrees to the ground.
A) What is the magnitude of the plane's total displacement? answer in units of km.
B) At what angle above the horizontal is the plane's total displacement? Answer in units of degree.

without time at each angle, one might as well whistle into a hurricane.
Get the times, so you can get the distances. Then break up each distance into horizontal and vertical components, then add horizontal to horizontal, vertical to vertical, and you have the final position.