An athlete completes one round of a circular track of radius 10 m in 40 sec. The distance covered by him in 2 min 20 sec is

70 m

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140 m

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110 m

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220 m

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Solution

The correct option is D 220 m
Time period = 40 sec
No. of revolution = $\frac{T o t a l t i m e}{T i m e p e r i o d} = \frac{140 s e c}{40 s e c} = 3.5 R e v .$
So, distance = $3.5 \times 2 π R = 3.5 \times 2 π \times 10 = 220 m$ .

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