the wheel of a an engine7 1 2 metres in circumference makes..., Latest Questions, General Mathematics

Question:The wheel of a an engine`7 1/2` metres in circumference makes 7 revolutions in 9 seconds. The speed of the train in km per hour is :

/139

+ AnswerB

+ ExplanationDistance covered in 7 revolutions

`= (7 xx 2 xx 22/7 xx 15/2) m`

`= 330 m.`

Distance covered in 9 sec m.

Distance covered in 1 hour

`= (330/9 xx (60 xx 60)/(1000)) m`

`= 132 km`

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Question:The wheel of a an engine`7 1/2` metres in circumference makes 7 revolutions in 9 seconds. The speed of the train in km per hour is :

A 150

B 132

C 130

D 135

B