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

If the radius of the earth is 3959 miles, find the speed in miles per hour.

Problem Statement: EE Board April 1997

A ship on a certain day is at latitude 20ºN and longitude 140ºE. After sailing for 150 hours at a uniform speed along a great circle route, it reaches a point at latitude 10ºS and longitude 170ºW. 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

Problem Answer:

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

Solution:

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