What distance does electromagnetic radiation travel in 55.0 μs ?

Electromagnetic radiation is an energy that is known as light. so electromagnetic radiation will have the same speed as the speed of light which is 3 x 10^8 m/s. so the distance it travel at 55 x 10^-6 s is:
D = ( 3 x 10^8 m/s ) (  55 x 10^-6 s )
D = 16500 m

Nervous, defensive

Gertrude is a difficult character to decipher, because of the lack of dialogue this character displays. For the most part, she remains passive, and obeys the commands of her husband. Towards Act IV, however, we can appreciate that she is starting to feel repentant and guilty about her marriage, which makes her adopt a defensive position. Moreover, both when she faces Claudius after Hamlet kills Polonius, and when she witnesses the insanity of Ophelia, she appears nervous, and unsure of how to act.