A telescope has lenses with focal lengths 1 = +30.0 cm and 2 = +5.0 cm. (a)

Question:

A telescope has lenses with focal lengths ƒ1 = +30.0 cm and ƒ2 = +5.0 cm.
(a) What distance between the two lenses will allow the telescope to focus on an infinitely distant object and produce an infinitely distant image?
(b) What distance between the lenses will allow the telescope to focus on an object that is 5.0 m away and to produce an infinitely distant image?