Answer :

Area of circular park = 88704 m^{2}

and Area of circle = πr^{2} = 88704

⇒ r^{2} = 28224

⇒ r = √28224

⇒ r = 168m

[taking positive root, because radius can’t be negative]

Perimeter of circle = 2πr

= 1056 m

= 1.056 km

So, total distance after 10 rounds = 1.056 × 10 = 10.56km

Now, we know that

Here, Speed = 4.5 km/hr

Distance = 10.56 km

Putting value in formula, we get

= 2.34 hour

= 2 hours 20 minutes 24 seconds

Hence, Rajeev will take 2 hours 20 minutes and 24 seconds to walk 10 rounds.

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