Solve the problem.A boat heads upstream a distance of 30 miles on the Mississippi river, whose current is running at 5 miles per hour. If the trip back takes an hour less, what was the speed of the boat in still water? Give the answer rounded to two decimal places, if necessary.
A. 18.03 mph
B. 6 mph
C. 16.58 mph
D. 15 mph
Answer: A
You might also like to view...
Find the limit.
A. ?
B. 
C. 
D. 1
Find the zero of the linear function.f(x) = -x + 4
A. 0 B. -4 C. -8 D. 4
Solve the problem.Suppose that the speed of a car, measured in miles per hour (mph), is monitored for some short period of time after the driver applies the brakes. The following table and graph relate the speed of the car to the amount of time, measured in seconds (sec), elapsed from the moment that the brakes are applied.
What general trend do the data reflect? In which of the time intervals does the speed change the most?
A. With increasing elapsed time, the speed decreases. The speed changes most during the time interval from 12 seconds to 15 seconds. B. With increasing elapsed time, the speed decreases. The speed changes most during the time interval from 3 seconds to 6 seconds. C. With increasing elapsed time, the speed increases. The speed changes most during the time interval from 12 seconds to 15 seconds. D. With increasing elapsed time, the speed increases. The speed changes most during the time interval from 3 seconds to 6 seconds.
Solve the problem.One leg of a right triangle is 
longer than the other, and the hypotenuse is 
longer than the shorter leg. Find the lengths of the three sides of the triangle.
A. 5 in., 12 in., 13 in. B. 6 in., 13 in., 14 in. C. 4 in., 11 in., 12 in. D. 4 in., 11 in., 14 in.