Posted by jim on Thursday, December 8, 2011 at 9:45pm.
A navy destroyer is exactly 62 miles south of an aircraft carrier, which is travelling W18°S at 24 mph. What
speed and bearing must the destroyer maintain if it is to reach the aircraft carrier in exactly 2 hours ?

pre calc  Damon, Thursday, December 8, 2011 at 10:03pm
$%^& math teachers do not know navigation. They say "bearing" when they mean "heading" but anyway:
Where will the carrier be in two hours if it starts at the origin at t = 0?
48 miles from origin at 18 degrees S of W
That puts it at x = 48 cos 18 = 45.65
and y =  48 sin 18 = 14.83
Now the destroyer was at (0, 62) at t = 0
In two hours it must go North 6214.83 = 47.17 miles North
In two hours it must go 45.85 miles West
distance = sqrt(45.85^2 + 47.17^2)
= 65.78 miles in two hours
so 65.78 /2 = 32.89 knots assuming those miles are nautical miles
tan angle west of north = 45.85/47.17
so angle west of north = 44.2 west of north
360  44.2 = 315.8
so steer a heading of 316 degrees true at 32.9 knots
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