Area of original play ground = 60*40 = 2400m2
area of new playground = 63 *43 ( since extended by 3m ) = 2709m2

extended area = 2709 - 2400 = 309m2
Area of the play ground=l*b

lenght of the extended path along the lenght=60+(3+3)   

breadth of the extended path along the breadth=40+(3+3)

area of both extended area and play ground =46*66 
area of the extended path=area of both  - area of play ground
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