Power is the work performed divided by time in seconds. The work is the force times distance:

the time in seconds is 60*11+30=690s so the power is

So choice B
Training behaviors..........................................
Answer:
The force will be cut in half also so the new force will be 18 N (d).
Well, if i am correct. a substance is:
a particular kind of matter with uniform properties
or...
the real physical matter of which a person or thing consists and which has a tangible, solid presence.
choose which ever you like better:)