The Top of a Ladder Slides Down a Vertical Wall $0.1$

Multiple Choice

The top of a ladder slides down a vertical wall at a rate of $0.1$ m/s . At the moment when the bottom of the ladder is 3 m from the wall, it slides away from the wall at a rate of 0.2 m/s . How long is the ladder?

A) $7 \mathrm{~m}$
B) $2.3 \mathrm{~m}$
C) $2 \mathrm{~m}$
D) $2.8 \mathrm{~m}$
E) None of these