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Students of a school staged a rally for cleanliness compaign. They walked through the lanes in two groups. One group walked through the lanes `A B ,\ B C\ a n d\ C A ;` while other through `A C ,\ C D\ a n d\ D A` (See in Figure). Then they cleaned the ara enclosed within their lanes. If `A B=9m\ B C=40 m ,\ C D=15 m ,\ D A=28 m ,\ a n d\ /_B=90^0dot` Which group cleaned more area and by how much? Find the total area cleaned by the students.

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