The diameter of each wheel of the truck is 210 cm. If each wheel rotat

1.	The diameter of each wheel of the truck is 210 cm. If each wheel rotates 200 times per minute, then what will be the speed of the truck (km/h)?1. 73.1 km/hr2. 74.8 km/hr3. 75.7 km/hr4. 79.2 km/hr5. 80.5 km/hr
Answer» Correct Answer - Option 4 : 79.2 km/hr Given: Diameter of each wheel of truck = 210 cm Rotation of wheel = 200 times/minute Concept: Total distance covered by the truck is n times of circumference Formula used: Circumference of the circle = 2πr Calculation: Circumference of wheel = 2πr ⇒ Circumference of wheel = 2 × (22/7) × 105 ⇒ Circumference of wheel = 660 cm Total distance covered by wheel of the truck = (660 × 200)/(1000 × 100) = (66 × 2)/100 km Now, Speed of the truck (in km/h) = (66 × 2 × 60)/100 = 79.2 km/h ∴ Speed of truck is 79.2 km/hr

The diameter of each wheel of the truck is 210 cm. If each wheel rotates 200 times per minute, then what will be the speed of the truck (km/h)?1. 73.1 km/hr2. 74.8 km/hr3. 75.7 km/hr4. 79.2 km/hr5. 80.5 km/hr

Answer» Correct Answer - Option 4 : 79.2 km/hr

Given:

Diameter of each wheel of truck = 210 cm

Rotation of wheel = 200 times/minute

Concept:

Total distance covered by the truck is n times of circumference

Formula used:

Circumference of the circle = 2πr

Calculation:

Circumference of wheel = 2πr

⇒ Circumference of wheel = 2 × (22/7) × 105

⇒ Circumference of wheel = 660 cm

Total distance covered by wheel of the truck = (660 × 200)/(1000 × 100) = (66 × 2)/100 km

Now, Speed of the truck (in km/h) = (66 × 2 × 60)/100 = 79.2 km/h

∴ Speed of truck is 79.2 km/hr

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