exam Maths Puzzle Numerical Ability

A plane leaves an airport traveling at an average speed of 240 kilometers per hour. How long will it take a second plane traveling the same route at an average speed of 600 kilomenters per hour to catch up with the first plane if it leaves 3 hours later?

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A student did a word processing job for $24. It took him 1 hour longer than he expected, and therefore he earned $4 less an hour than he anticipated. How long did he expect that it would take to do the job? Evaluate and solve the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.