the diameter of the driving wheel a bus is 140 cm, Area, General Mathematics

Question:The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 kmph ?

Answer Distance to be covered in 1 min.

 $= (66 xx 1000/60) m$ 

 $= 1100 m.$ 

Circumference of the wheel 

 $= (2 xx 22/7 xx 0.70) m$ 

 $= 4.4$ 

:. Number of revolutions per min

 $= (1100/4.4)$ 

 $= 250$

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The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 kmph ?

Question:The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 kmph ?

Answer Distance to be covered in 1 min. =(66×100060)m= (66 xx 1000/60) m =1100m.= 1100 m. Circumference of the wheel =(2×227×0.70)m= (2 xx 22/7 xx 0.70) m =4.4= 4.4 :. Number of revolutions per min =(11004.4)= (1100/4.4) =250= 250

Answer Distance to be covered in 1 min. $= (66 xx 1000/60) m$ $= 1100 m.$ Circumference of the wheel $= (2 xx 22/7 xx 0.70) m$ $= 4.4$ :. Number of revolutions per min $= (1100/4.4)$ $= 250$