HELLO JHUVI THE PROBLEM IS VERY EASY
FIRST,
F=5.8X10^2N & DISPLACEMENT (D)=8M
NOW, WORK=FORCE (F) X DISPLACEMENT (D)
SO WORK =5.8X10^2X8 = 4640 N/M
SO WE HAVE WORK WHICH IS 4640 N/M
SECOND,
POWER = WORK /TIME
SO, POWER = 4640/15 (T=15 MIN GIVEN IN QUESTION)
SO POWER = 309 WATT
THATS IT SIMPLE