Question

A man runs round a circular field of radius 50m at speed of 12km/hr. What time is taken by the man to make 20 rounds of the field?
(Answer is 31 3/7 but i want explanation of this question.)
If you will tell right explanation i will mark you in brainlist.​

Answer 1

★$\huge\bf{\blue{\underline{Question:-}}}$

A man runs round a circular field of radius 50m at speed of 12km/hr. What time is taken by the man to make 20 rounds of the field?

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★$\huge\bf{\red{\underline{Answer:-}}}$

Time taken =15 mins 42 seconds

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★$\huge\bf{\green{\underline{Explanation:-}}}$

Given that : Radius of circle =r=50 m

Speed of man =12 km/hr =360012×1000=3.33 m/s

Distance travelled in one round =2πr=314m

⇒ Distance travelled in ten rounds =3140 m

Time taken = Distance÷Speed =3.333140=942 seconds

∴ Time taken =15 mins 42 seconds

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