Ahorse moved a sleigh 1.00 kilometer by applying a horizontal 2000 newton force on its harness for 45.0 minutes . what is the power of the horse

Work = (force) x (distance)

         = (2,000 N) x (1,000 m)

         =    2,000,000 joules

Power  =  (work done) / (time to do the work)

             =  (2,000,000 joules) / (45 minutes) 

             =  ( 44,444 and 4/9) joules per minute

             =      740.74 joules per second  =  740.74 watts .

Note:  This is almost exactly 1 "horsepower".
            1 horsepower = 746 watts .