exam Maths Puzzle Numerical Ability

an airplane tooke 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.

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exam Other Question

The best base to determine the solution to 2^2x + 1 = 4^x is:
@ Since 4 is a multiple power of 2, 2 is the best base.
a. b = 10
b. b = 2
c. b = e
d. None of the above, there is no solution to the problem How many versions of a test are required to cover all possible question arrangements if there are nine open-ended questions on the test?