Solve the Problem $640 \mathrm {~km} / \mathrm { hr }$

Multiple Choice

Solve the problem.
-The air speed of an airplane is $640 \mathrm {~km} / \mathrm { hr }$ and its angle of climb is $9.13 ^ { \circ }$ . What is its ground speed (to the nearest $\mathrm { km } / \mathrm { hr } )$ ?

A) $632 \mathrm {~km} / \mathrm { hr }$
B) $617 \mathrm {~km} / \mathrm { hr }$
C) $622 \mathrm {~km} / \mathrm { hr }$
D) $627 \mathrm {~km} / \mathrm { hr }$