1. An exeroplane three from town A (20°N, bo to town 1 (20°N, 20° E ). If the journey takes 6 hours. a. Calculate correct to 3 significat figures, the average speed of the
b. If it then flies due North from town B to town C 420km away. calculate correct to the rearest degree, the latitude of town C. (take radius of the earth=6400km.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?