Answer:
180° is galf a full turn, so it takes 1/2 less time that is 20 seconds
90° is 1/4 of a full turm (360°), so it will take (1,4)×40= 10 seconds
45° is 1/8 of 360, so it will take 5 seconds
270° IS 3/4 pf 360°, so the answer is (3/4)×40 = 30 seconds
