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Diameter of wheel of a cycle is 21 cm. The cyclist takes 45 minutes to reach a destination at a speed of 16.5 km/hr. How many revolutions will the wheel make during the journey?
- A12325
- B18750
- C21000
- D24350
Answer not set
Discussion 1
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CCommunity
Perimeter of tyre can be given as = πD = (22/7) × 21
⇒ Perimeter of tyre = 66 cm = .00066 km
Distance covered by cyclist in 45 minutes or 45/60 hrs can be given as
⇒ 16.5 × (45/60)
⇒ 16.5 × 3/4
Revolution can be given as total distance covered by cycle/perimeter of tyre
⇒ 16.5 × 3/(4 × .00066) = 18750
∴ The total revolutions are 18750
⇒ Perimeter of tyre = 66 cm = .00066 km
Distance covered by cyclist in 45 minutes or 45/60 hrs can be given as
⇒ 16.5 × (45/60)
⇒ 16.5 × 3/4
Revolution can be given as total distance covered by cycle/perimeter of tyre
⇒ 16.5 × 3/(4 × .00066) = 18750
∴ The total revolutions are 18750