Question

the length of rectangular field is twice its breadth.Natasha jogged around it 5 times and covered a distance of 3 km . what its length of the field ?

Answer 1

breadth=x
length=2x
perimeter=2(l+b) 
              =2(2x+x)
              =6x
therefore
6x*5=3km
6x*5=3000cm
6x=600
x=100
therefore length=200cm
              breadth=100cm

Answer 2

breadth=x
length=2x
perimeter=2(l+b)
=2(2x+x)
6xt herefore
6 x*5=3km6x*5=3000cm6x=600x=100 
therefore  length=200cm       
       breadth=100cm