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Q.

The distance, in kilometers, a wheel of 25 cm radius will cover if it rotates 350 times is


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a

55 km

b

60 km

c

65 km

d

70 km 

answer is A.

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Detailed Solution

Given, a wheel of 25 cm radius will cover if it rotates 350 times.
We know that the total distance covered in 1 rotation of a wheel is the circumference of the wheel.
So, as per the question, the total distance covered in 350 rotations of the wheel will be 350 times its circumference, i.e.,
=350×2πr = 350 × 2× 22 7 ×25 =55000 cm
Now, 1 km = 1000cm.
So, the total distance covered by the wheel is 55 km.
Hence, the correct option is (1).
 
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