book Maths Puzzle Numerical Ability

what are the objects in a set called?

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book Other Question

An airplane flew for 4 hours with a 20-km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air. I saw a similar problem posted but am not sure of the solution to this one. Can someone help?
16^3/2
I got the answer as 6, because 16 = 4^4 and 4 times 3/2 = 12/2 =6 am I right? If not can someone please explain? Thanks.