Calculating the Distance Walked by Reena:

To calculate the distance walked by Reena in a month, we need to determine the distance covered in one round of the park and then multiply it by the number of rounds she walks.

Calculating the Distance Covered in One Round:

The rectangular park is 2 km long and 40 m wide. We need to convert the width to kilometers to ensure both measurements are in the same unit.

1 km = 1000 m

Therefore, the width of the park in kilometers is:

40 m / 1000 = 0.04 km

Since Reena walks around the entire park, the distance covered in one round is:

Distance = 2 km (length) + 2 × 0.04 km (width) = 2 km + 0.08 km = 2.08 km

Calculating the Total Distance Walked in a Month:

Reena walks 15 rounds of the park in a month. To find the total distance walked, we multiply the distance covered in one round by the number of rounds:

Total Distance Walked = Distance per Round × Number of Rounds

Total Distance Walked = 2.08 km × 15 = 31.2 km

Therefore, Reena walks a total distance of 31.2 kilometers in a month.

Explanation:

Reena walks around a rectangular park that is 2 km long and 40 m wide. The width is converted to kilometers to ensure consistency in measurement units. The distance covered in one round is calculated by adding the length and twice the width. Finally, the total distance walked in a month is found by multiplying the distance per round by the number of rounds. The answer is 31.2 kilometers.