An easy "rule of thumb" is that a nautical mile is 15% longer than a statute mile, so if you multiply statute miles by 1.15 you will have a close approximation.
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mph x 0.868976242 = knots per hour
49 knots=56.388193 miles per hour
11 knots=12.6585739 miles per hour
439 knots=505.192178 miles per hour
36 knots=41.4280601 miles per hour