The dimensions of a rectangular field are 90 m and 70m . A man walks around it at a uniform speed of 4 km/hr
. Find the time taken by him to walk around the field five times .
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The perimeter is:
+P+=+2%2A90+%2B+2%2A70+
+P+=+180+%2B+140+
+P+=+320+ m
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His speed is:
+4000+ m/hr
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5 rounds is:
+5%2A320+=+1600+ m
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+d+=+r%2At+
+t+=+d%2Fr+
+t+=+1600+%2F+4000+
+t+=+.4+ hrs
Convert to minutes:
+.4%2A60+=+24+
He takes 24 min to make 5 rounds
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