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Q.

The diameter of a wheel making 5000 revolutions covering 11km is [[1]] cm.


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answer is 70.

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Detailed Solution

The diameter of a wheel making 5000 revolutions covering 11km is 70cm.
To find the circumference of the wheel, we will divide the distance covered by the wheel by the number of revolutions it took.
First, we will convert the units into a single unit.
1km=100000cm
11km=1100000cm
Now, circumference= 1100000 5000
2πr=220
2× 22 7 ×r=220
r=35cm
We also know that diameter is twice the radius, so the diameter is 2(35)cm which is 70cm.
Hence, the correct answer is 70cm.
 
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