a rectangular field is 72 m by 58 m walk around it at the rate of 3 km per hour what time will he take in taking two rounds.
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1
perimeter of 2 rounds = 520 m .. 1 hr = 3km .. 52/5 minutes = 10.4 minutes
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5
The speed in m/s = 3*5/18
= 5/6 m/s
The perimeter of the field = 2(72+58)
= 2*140
= 280 m
By walking twice around the field he covers = 2*280
= 560 m
5/6 m is covered in 1 second
1 m is covered in (6/5) seconds
560 m is covered in (6*560/5) seconds
= (6*112) seconds
= 672 seconds
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