A Cart Wheel Makes 9 Revolutions per Second. If the Diameter of the Wheel is 42 Cm, Find Its Speed in Km/Hr. - Mathematics

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Sum

A cart wheel makes 9 revolutions per second. If the diameter of the wheel is 42 cm, find its speed in km/hr. 

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Solution

Circumference = 2 π r = π d

`= 22/7 xx 42`

= 132 cm = 1.32 m

Circumference= 1.32 m

No. of revolutions = 9 per second 

No. of revolutions per hour = 9 x 60 x 60 = 32400 

Distance covered in one hour= 32400 x 1.32 = 42768m/hour 

Speed of the wheel in km/hour = `42768/1000 = 42.768` km/hour = 43 km / hr

Speed = 43 km/hr

  Is there an error in this question or solution?
Chapter 19: Mensuration I - Exercise 19.1

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Frank ICSE Class 10 Mathematics Part 2
Chapter 19 Mensuration I
Exercise 19.1 | Q 30

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