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A rectangular field is 50m $ \times $ 40m. Ramesh goes 20 times around it. How much distance does he cover?

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Answer
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Hint: Perimeter of any shape is equal to the length around the shape.

Complete step-by-step answer:
Given that a field is in rectangular shape with dimensions 50m $ \times $ 40m
$ \Rightarrow $ length = 50m and breadth 40m.
The rectangular field is similar to the below figure.

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We know that the perimeter of any rectangle is equal to the sum of measurements of all sides.
$ \Rightarrow $ Perimeter of the given rectangular field = 40 + 50 + 40 + 50 = 180m
The distance covered by a person when he runs around that field = perimeter of field = 180m
Ramesh goes around the field 20 times. That means he covered the perimeter 20 times.
$\therefore $ Distance covered by Ramesh = $20 \times 180 = 3600m$

Note: When a surface is in rectangular shape with length ‘l’ and breadth ‘b’, then perimeter = 2(l + b). We can directly use this formula to calculate the perimeter of the rectangle.