12. A rectangular field is measured 290 m by 210 m. How long will it take for a girl to go round the field if she walks at the rate 5m/sec?
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perimeter of rectangle = 2(L+B)
= 2 × 500=1000 m
speed = 5m/ sec
Distance = S × T = 5×1=5
it means a girl walk in 5m in 1 sec
She walks 5×1000m = 5000m in 1000sec (16min 6sec ).
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