In Outer Space,there Are Two Astronauts at Rest,one 20

In outer space,there are two astronauts at rest,one 20.0 m from the space shuttle and the other 40.0 m away from the shuttle.By using a 20-W laser,the astronaut located 40.0 m away from the shuttle decides to propel the other astronaut towards the space shuttle.He focuses the laser on a piece of totally reflecting fabric on her space suit.If her total mass with equipment is 100 kg,how long will it take her to reach the space shuttle?

A) 2.2 hours
B) 10 hours
C) 23 hours
D) 48 hours