Solve the problem.A plane flies 480 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 20 mph, what is the speed of the plane in still air?
A. 105 mph
B. 90 mph
C. 100 mph
D. 125 mph
Answer: C
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Solve the problem.Find the center of mass of the hemisphere 
if the density is proportional to the distance from the center.
A. 
B. 
C. 
D. 
Solve the problem.If the probability that an identified hurricane will make a direct hit on a certain stretch of beach is 0.04, what are the odds in favor of a direct hit?
A. 1 to 25 B. 1 to 23 C. 24 to 1 D. 1 to 24
Use rational equations to solve the problems.A loaded moving truck is traveling 20 mph faster than a freight train. In the time it takes the train to travel 60 miles, the truck travels 100 miles. Find the speed of the truck.
A. 20 mph B. 100 mph C. 50 mph D. 10 mph
Solve the problem.A loan made on September 28 is due on March 15. Find the exact time for the loan in a non-leap year.
A. 168 days B. 167 days C. 172 days D. 138 days