Concept:Time changes by 4 minutes for every 1∘ change in longitude.Explanation:Difference in longitude =80∘E−20∘E=60∘Since 1∘=4 minutes,60∘=60×4=240 minutes240 minutes =4 hoursTown B is more to the east, so its time is ahead of town A.9:00 a.m. +4 hours =1:00 p.m.Answer:A. 1:00 p.m.