MediumSpace
How long for the ISS to orbit the Earth?
Riddle
How long for the ISS to orbit the Earth?
Choose an answer
A.24 hours
B.12 hours
C.45 minutes
D.90 minutes
Hint: It's a word with 7 letters, starting with "9".
Answer
90 minutes
Why this is the answer
The ISS travels at 17,500 mph, completing about 15.5 orbits per day.
This riddle is filed under Science Riddles and rated Medium.