A space shuttle orbits the earth at about 6 kilometers per second. This speed is equal to how many kilometers per hour? Choose the correct choice from the following: A) 480 B) 2,880 C) 21,600 D) 28,800 E) 48,000
Seconds in 1 hours:   60s in 1 min   60 min in 1 hr   60*60= 
<gadget id="calculator">60*60</gadget>
<output>3_600</output>
3600 sec in 1 hr   6*3600=21,600   Answer: 21,600
<result>C</result>
A space shuttle orbits the earth at about 6 kilometers per second. This speed is equal to how many kilometers per hour?