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Q.

A field 360 m long and 120 m wide has two cross roads in the centre. Each road is 3 m wide .Find the area of the cross road

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a

   1431m2

b

   1321m2

c

   1280m2

d

   1300m2 

answer is A.

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Detailed Solution

Length =360m Width = 120m
Area of rectangle = l X b =360X120 m =43,200 m2
Area of vertical cross road +Area of horizontal cross road - Area of one cross section of dimension 3×3 So , Area of cross roads
= 360 m x 3 m + 120m x 3m -3m x 3m On solving , we get
=1080 m2 + 360 m2 - 9 m2 =1431 m2
 
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