exam Maths Puzzle Numerical Ability

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

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Solve and write interval notation for the solution set


2x-3 less than or equal to -5 or 2x+1 greater than or equal to 2
can you help me in solving this problem:

if one-half of one integer is subtracted from three-fifths of the next consecutive integer, the difference is 3. what are the two integer.