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What will be the rpm of a car tire at speed 10 kmh?

The formula to calculate the revolutions per minute (rpm) of a car tire is:

```

rpm = (speed in km/h) * (60 / tire circumference in meters)

```

Let's assume the tire circumference is 2 meters. Substituting the given values into the formula, we get:

```

rpm = (10 km/h) * (60 / 2 m)

rpm = 300 / 2

rpm = 150

```

Therefore, the rpm of the car tire at a speed of 10 km/h will be 150 rpm.