A racing car completes the first lap of a race at a speed of 600 miles per hour and the second lap at a speed of 900 miles per hour. Find the average speed of the car for both laps (in mph).

What is the average number of students in B.Tech (220), M.Tech (140), and B.A (4344) courses together?

A class has two sections A and B, which have 36 and 44 students respectively. If the average weight of section A is 40 kg and that of section B is 35 kg, find the average weight of the whole class.