the length and breadth of playground are 80 metre and 30 metre respectively how long will a boy take to go three times round the field, if he walks at rate of 1.5 metre per second
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Length of playground = 80 m
breadth of playground = 35 m
Speed = 1.5 m/sec.
Area of playground
= Length × breadth
= 80 × 35
= 2800 sq. m
i) Cost of levelling
= 4.5 × 2800
= 12600.0
= Rs. 12600
ii) perimeter of field
= 2 ( length + breadth)
= 2 ( 80 + 35 )
= 2 × 115
= 230 m
Distance covered by boy
= 3 × 230
= 690 m
speed = 1.5 m/sec.
Time = Distance / speed
= 690/1.5
= 460 sec.
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