What is 9.7 seconds in miles per hour?

Answer 1

"Seconds" describe an amount of time, but "miles per hour" describe a speed.

You can't convert an amount of time into speed. If you could, you'd hear sailors

telling about how many knots they spent at sea.

You can't convert speed into an amount of time either. If that were possible,

then you'd see signs on the highway like: "Speed Limit 45 Minutes".