Misc: Leatherjackets are the larvae of which insect?

Questions

A day on ---------- is about 9 hours, 50 minutes, 30 seconds at the equator.?

Driving at ---------- miles per hour, it would take 258 days to drive around one of Saturn's rings.?

Driving at 75 miles per hour, it would take ---------- days to drive around one of Saturn's rings.?

Driving at 75 miles per hour, it would take 258 days to drive around one of ---------- 's rings.?

---------- blood cells are destroyed in the human body every second.?