Karlus runs at a constant speed and travels $9$ meters in $4$ seconds.

If Karlus runs for $8$ seconds at this constant speed, how far will he travel?

meters

If Karlus runs for $1$ second at this constant speed, how far will he travel?

meters

What is the constant speed that Karlus runs at$?$

meters per second

If Karlus runs for $2\mathrm{.}8$ seconds at this constant speed, how far will he travel?

meters