An Astronaut Is Stranded in Space a Distance of 50 $\times$

An astronaut is stranded in space a distance of 50 m from her spaceship.She carries a 5-kW laser gun.If the total mass of the astronaut,space suit,and laser gun is 90 kg,approximately how long will it take her to reach her ship if she points the laser gun directly away from it?

A) 3.2 h
B) 6.5 h
C) 13 h
D) 2.3 $\times$ 10⁴ h
E) 3.2 $\times$ 10⁴ s