# area of a circular field is154 sq.m. find the time taken byan athlete to complete 2 rounds if the speed is 5 km per hour?

Suppose r be the radius of circular field.
Then area of circular field =

Then circumference of circular field = m
So distance of one round of circular field = circumference of circular field = 44 m
Then distance of 2 round of circular field = $44×2$ = 88 m
Speed = 5 km/hr =
Therefore time taken to cover 2 round of circular field =

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