A space shuttle orbits the earth at about 2 kilometers per second. This speed is equal to how many kilometers per hour?  Select:
A) 7,200
B) 8,880
C) 10,800
D) 28,800
E) 48,000

Rationale: "seconds in 1 hours : 60 s in 1 min 60 min in 1 hr 60 * 60 = 3600 sec in 1 hr 2 * 3600 = 28,800 answer : a"
Answer: A