Stars nearby to our sun have an average relative speed of about 70,000 km/hour. How fast is that in km/s?
A)about 1200 km/s
B)about 4.2 million km/s
C)about 20 km/s
D)about 3000 km/s

Question

Quizplus · Accepted Answer

To convert km/hour to km/s, we need to divide by 3600 (the number of seconds in an hour). So,
70,000 km/hour / 3600 seconds/hour = 19.44 km/s
Rounding to the nearest whole number, we get the answer of 20 km/s, which is choice C.

Stars Nearby to Our Sun Have an Average Relative Speed