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

a box contains 4 blue balls, 5 green balls and 3 yellow balls you randomly select 3 balls, one at a time, from the box without replacing a selected ball. What is the probability o will you please help me with this: what is (12a+6/5a^2)(6/a+1)(5a+5/2a+1)