Solve the problem. Round your answer to the nearest tenth, if necessary.Two pipes together can fill a large tank in 10 hr. One of the pipes, used alone, takes 15 hr longer than the other to fill the tank. How long would each pipe take to fill the tank alone?
A. 10 hr; 25 hr
B. 15 hr; 30 hr
C. 25 hr; 40 hr
D. 12.5 hr; 27.5 hr
Answer: B
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Solve the problem.Find the work done by a force of 8i (newtons) in moving as object along a line from the origin to the point 
(distance in meters).
A. 16.97 joules
B. 24
joules
C. 24 joules
D. 8
joules
Solve the problem.A certain person burns 6.5 calories per minute while walking. How many calories will be burned if that person walks for 2 hours?
A. 780 calories B. 7800 calories C. 13.0 calories D. 130 calories
Solve the problem.Suppose that the function y = f(x) is increasing on the interval (2, 8). Over what interval is the graph of 
increasing?
A. (2, 8) B. (-3, 3) C. (7, 13) D. (10, 40)
Answer the question.Write an "area" word problem for which finding the solution would involve evaluating the double integral
What will be an ideal response?