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Q.

The diameter of the car wheel is 70cm. How many revolution will it make to travel 1.65Km


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a

 750

b

 780

c

 760

d

 740 

answer is A.

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Detailed Solution

Concept: The wheel will rotate once, covering a distance equal to its circumference. Therefore, it needs to be rolled more than thrice to cover the 1.65 km distance. So compare them and determine how many turns there are.
Given,
Diameter d=70cm , radius r=35cm
Circumference  of the circle =Question ImageQuestion ImageNow, the wheel must continue to turn until it covers the distance.
Question ImageLet n be the number of turns.
Question ImageHence, the correct answer is option 1.
 
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