A car has wheels of diameter 70 m. How many revolutions can the wheel complete in 20 minutes if the car is travelling at a speed of 110 m/s?

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Solution

Distance travelled by car in 20 minutes = $110 \times 20 \times 60 = 132000$ m
Distance covered in one revolution = 2 $π$ r= $220 m$
No. of revolutions = $\frac{132000}{220} = 600$

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