a field is rectangular is 90m×70m . A man walks found it at the rate of 4m per second . what time will he take in making five rounds ?
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1min20sec
Step-by-step explanation:
perimeter=2(90+70)
2*160
320 m
Speed- 4m/s
Time taken- 320/4
80 second
1 min 20 second
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