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Solution :

1 revolution of wheel = distance of `1* `circumference <br>
time = `10min = 10/60 hrs` <br>
speed `= (66 km)/(1hr) ` <br>
distance `= 66*10/60 = 11km = 11000m` <br>
revolution = total distance/circumference <br>
`= 11000/(2 pi r)` <br>
`= 11000/(2*22/7*0.4)` <br>
`= 7000/(4*0.4)` <br>
`= 70000/(4*4)` <br>
`=4375` revolutions <br>
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