How long will a man take to make a round of circular field of radius $12 m$ , cycling of speed of $8 k m / h r$ .

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Solution

$T i m e = \frac{C i r c u m f e r e n c e}{s p e e d}$
$\Rightarrow$ Circumference $= 2 \times \frac{22}{7} \times \frac{12}{1000} k m = \frac{66}{875} k m$

$\Rightarrow$ Time $= \frac{66}{875} \times \frac{1}{8} = \frac{33}{3500} h r s$

$= \frac{33}{3500} \times 3600 s e c$
$= 33.94 s e c .$
Hence, the answer is $33.94 s e c .$

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How long will a man take to make a round of circular field of radius 12 m, cycling of speed of 8 km/hr.

Time=Circumferencespeed⇒ Circumference =2×227×121000km=66875km⇒ Time =66875×18=333500hrs =333500×3600sec =33.94sec.Hence, the answer is 33.94sec.

How long will a man take to make a round of circular field of radius $12 m$ , cycling of speed of $8 k m / h r$ .