A man runs around the square park of side 15 m. How many rounds should he take in order to cover 420 m ?
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perimeter of square park(the distance covered for completing one round around the square park )=4xside
=4x15m=20m
total distance=420m
no of rounds=total distance travelled by man/distance covered for completing one round(perimeter)
=420m/20m=21 rounds
therefore the man will cover 21 rounds of the square park to cover 420 m
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