Two cross roads, 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.`

Explanation

To find the area of the roads and the cost of constructing them, we can follow these steps:

### Step 1: Understand the dimensions of the park and the roads
- The rectangular park has a length of 70 m and a breadth of 45 m.
- There are two roads, each with a width of 5 m, running at right angles through the center of the park.

### Step 2: Calculate the area of each road
- **Area of the horizontal road (PQRS)**:
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