Question: 13. Three computers can sort tasks in 20 minutes, 30 minutes and 60 minutes, respectively. Find how long it takes to do sorting task if

13. Three computers can sort tasks in 20 minutes, 30 minutes and 60 minutes, respectively. Find how long it takes to do sorting task if all three computers run together?

14. A ball is thrown across a playing eld. Its path is given by the equation f(x) = 0.005x2 + x + 8, where x is the distance the ball has traveled horizontally, and f(x) is the height of the ball above the ground, both in feet. What is the maximum height attained by the ball? When does the ball hit the ground?

15. The path of a diver is given by y = 4/9x^2 + 24/9x + 10, where y is the height in ft and x is the horizontal distance from the end of the diving board in feet. What is the maximum height of the diver? When does the diver hit the water?

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