Answers

2014-04-20T13:01:06+05:30
The length moved by man is 20(l+b)
where l-length b-width of the field
its speed is 12km/hr
so the distance/time=12
20(l+b)/(0.5)=12
l+b=6/20 km
as l=2b
3b=6/20
b=1/10 km 
l=2/10 km
area of the field=lb=(1/10)(2/10)=1/50 km^2
 \frac{1}{50} km^2= \frac{10^6}{50}=20000 m^2
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