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? (A nautical mile in a unit of measurement used at sea distance or sea water i.e., 1852 metres)
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⇒ Distance = speed × time
Since it is given that the distance travelled will be the same .
S1=16 nautical miles per hour.
S2=816×10=20 nautical miles per hour.
So the ship has to increase its speed from 16 to 20 natical miles per hour .
⇒ It has to increase its speed by "4 nautical miles per hour"