Question

The diameter of a wheel of a bus is 90cm which makes 315 revolutions per minute determine its speed in kilometre per hour

Answer 1

Diameter = 90 cm ⟹ r = 45 cm

circumference = 2×227×45 = 282.85

Distance covered in one revolution = 282.85 cm

∴Distance covered in 315 revolution=282.85×315=89097.75cm=89097.75100000=0.89097km

distance covered in 1 minute= 0.89097 km

distance covered in 60 minutes or 1 hr = 0.89097 * 60

= 53.45 Km/ hr

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Answer 2

Step-by-step explanation:

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