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 \pi = 22/7)
A
15,000km
B
10,000km
C
6,400km
D
5,000km
E
3,200km
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
D = \(\frac{\theta}{360}\) x 2\piR
45 + \(\frac{45}{360}\) x \(\frac{44}{7}\) x 6400
= 10057 ≅ 10000km
Source: Myschool Past Questions Archive (Record #23510)