Book Maths Puzzle Time Distance and Speed

An airplane travels 1820 miles in the same amount of time it takes a private plane to travel 520 miles. if the airliner's average speed is 52 mph more than three times the average

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Book Other Question

Four years ago, Marion was 2/3 as old as Les was. Now she is 3/4 as old as he is. How old is each now? The number N of guests that arrive at a mall food court each hour can be approximated by N = -12x^2 + 110x + 35, where x is the number of hours after 11:00 am. At what times, to the nearest minute, are 200 guests per hour arriving at the food court?

Thanks
Martin