Solve the problem.A power boat in still water maintains a speed of 45 miles per hour. The boat heads directly across a river perpendicular to the current which has a speed of 8 miles per hour. Find the actual speed and direction of the boat.
A. 45 miles per hour; 10° off course
B. 22 miles per hour; 21° off course
C. 17 miles per hour; 28° off course
D. 46 miles per hour; 10° off course
Answer: D
Mathematics
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A. x = 
, x = - 
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