# Solution: If the radius of the earth is 3959 miles, find the speed in miles per hour

(Last Updated On: January 20, 2020)

#### Problem Statement: EE Board April 1997

A ship on a certain day is at latitude °N and longitude 140ºE. After sailing for 150 hours at a uniform speed along a great circle route, it reaches a point at latitude 10°S and longitude 170°W. If the radius of the earth is 3959 miles, find the speed in miles per hour.

• A. 17.4
• B. 15.4
• C. 16.4
• D. 19.4

The speed of the ship is 16.56 NM/hr or 16.56 knots.

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