Two crossroads, each of width 5 m, run at right angles through the centre of a rectangular

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Question:

Two crossroads, each of width 5 m, run at right angles through the centre of a rectangular park of length 70 m and breadth 45 m and parallel to its sides. Find the area of the roads. Also, find the cost of constructing the roads at the rate of Rs $105$ per $m 2 .$