Question

A little boy pulls a 24.0-kg block over a rough
horizontal surface by a constant force of 11.0 N acting
at an angle of 37.0° as shown. If the boy pulls the box
6.20 m in 2.15 minutes, what would be his average
power output?
a. 3.51 W c. 5.83 W
b. 4.66 W d. 28.5 W

I'm not sure where to go with this question.

Answer 1

You require two definitions to solve this:

(1) Work is measured as a force acting over a given distance
(2) Power is measured as work done over a given time

So you need to figure out how much work is done.
Then simply divide that work by the amount of time taken to get the power.