Two ships on the equator are on longitudes 45oW and 45oE respectively. How far are they apart along the equator, correct to 2 significant figures? (Take the radius of earth = 6400km and π = 22/7)
D = \(\frac{θ}{360}\) x 2πR
45 + \(\frac{45}{360}\) x \(\frac{44}{7}\) x 6400
= 10057 ≅ 10000km
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