1.

The radius of each of the wheels of a bus is 30 cm. How many complete revolutions does each wheel make in 8 minutes if the bus is traveling at a speed of 45 kmph?1). 30922). 32683). 35614). 3727

Answer»

Number of Revolutions = Total DISTANCE/Distance covered in 1 revolution

Distance covered in 1 revolution = Circumference of wheel = 2πr = 2 × π × 30 = 60π

⇒ Speed = Distance/Time

⇒ 45 = Distance/(8/60)

⇒ Distance = 90/15 = 6 km

⇒ Distance = 6 × 1000 m = 6000 × 100 CM = 600000 cm

∴ Number of Revolutions = 600000/60π = 3184.71 ≈ 3184


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