The wheel of a lorry has radius 182 cm. The number of revolutions (approximately) per minute the lorry wheel will make is _______ (if the speed of the lorry is 66 km/h).  

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SSC CGL 2023 Tier-I Official Paper (Held On: 19 Jul 2023 Shift 2)
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  1. 100
  2. 96
  3. 1144
  4. 66

Answer (Detailed Solution Below)

Option 2 : 96
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Detailed Solution

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Concept used:

Circumference of a circle = 2 × π × r

Calculation:

The circumference of of the wheel = 2 × 22/7 × 182 = 1144 cm

Here, the lorry can go 66 km in 60 min, then the lorry can cover in 1 min is = 66/60 = 1.1 km = 110000 cm

Now the wheel of the lorry makes the number of revolutions per min is 110000/1144 = 96.15 ~ 96

∴ The correct answer is 96

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