Solve the Problem $120 \mathrm {~km} / \mathrm { h }$

Solve the problem.
-An airplane travels at $120 \mathrm {~km} / \mathrm { h }$ for $2 \mathrm { hr }$ in a direction of $120 ^ { \circ }$ from a local airport. At the end of this time, how far east of the airport is the plane (to the nearest kilometer) ?

A) $120 \mathrm {~km}$
B) $277 \mathrm {~km}$
C) $208 \mathrm {~km}$
D) $139 \mathrm {~km}$