17. •• A student notes that the length of a meter stick held by her professor (who is moving relative to her) is the same as that of her 12-in-long ruler (when oriented parallel to his ruler).

(a) What is their relative speed

(assuming they move in a direction parallel to their respective sticks)?

(b) If the professor takes 5.00 min to write an email according to his watch, how long did it take him to write it according to the student?