Question
The wheel of a motorcycle , 70 cm. in diameter, makes 40 revolution in every 10 second . What is the speed of the motorcycle in km/hr ?
Answer: Option C
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Distance covered in 10 sec. = `(2 xx 22/7 xx 35/100 xx 40)`m = 88 m.
Distance covered in 1 sec. = `88/10 `m = 8.8 m.
`:.` Speed = 8.8 m/s = `(8.8 xx 18/5)` km/hr = 31.68 km/hr.
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