A car is moving with the speed of 22 decimeter per second. If it performs 700 revolutions per second, the diameter of the wheel is?

Let r be the radius of the wheel.Distance covered in 1 revolution = circumference of wheel = 2πr dmDistance covered in 700 revolutions = 700 × 2πr = 1400πr dmTime taken to perform 700 revolutions = 1 secSpeed = 22 dm/sec1400πr1 = 221400 × 227×r = 22r = 1200 dmdiameter = 2r = 2 × 1200 = 0.01 dm = 1 mm

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