A plane flew due north at 380 mph for 4 hours. A second plane, starting at the same point and at the same time flew southeast at an angle 168° clockwise from due north for 4 hours. If, at the end of the 4 hours, the two planes were 2300 miles apart, how fast was the second plane traveling?
A) 18.3 mph
B) 772 mph
C) 193 mph
D) no solution

Question

Quizplus · Accepted Answer

The second plane traveled 2300 miles in 4 hours, so its speed was 2300 / 4 = 575 mph. The component of this speed in the north direction is 575 * cos(168°) = 193 mph.

A Plane Flew Due North at 380 Mph for 4