Answers

2016-01-11T21:18:08+05:30
In case of Kavita,
side = 90
perimeter = 4*side = 4*90= 360 m
but she had ran twice.So,total distance = 360*2= 720 m
In case of Vinita,
l= 120
b= 80
perimeter = 2*(l+b)
2*(120+80)
= 2*(200)=400m
But she had ran thrice
So,3*400= 1200 m
Total distance covered = 1200m

Vinita ran more by 480 m.
Hope this helped u.
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2016-01-12T14:55:43+05:30
perimeter

square field
s = 90m = 4 x s=4 x 90 = 360 m   360 x 2 = 720 m
rectangular field
l=120m ; b=80m = 2(l+b) = 2 x 120 + 80 = 2 x 200=400m    400 x 3=1200m
1200m>720m    1200-720 = 480 m
so we can say that vinita ran more dustance by 480 m
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