<PRE><B>Question 1103089</B>
A ship can cover a certain distance in 10 hours at a speed of 16 nautical miles per hour. By how much should its speed be increased so that it takes only 8 hours to cover the same distance? 
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d = r*t = 16*10 = 160 nm
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t = d/r
8 = 160/r
r = 20 knots
An increase of 4 knots.
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1 knot = 1 nm/hr</PRE>