Question
The wheel of an engine , `7 1/2`meres in circumference makes 7 revolutions in 9 seconds . The speed of the train in km per hour :
Answer: Option B
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Distance covered in 9 sec. = `(2 xx 22/7 xx 15/2 xx 7) ` m = 330 m
Distance covered in 1 sec. = `330/9 m = 110/3` m.
`:.` Required speed = `(110/3 xx 18/5)` km/hr = 132 km/hr.
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