Subject: General Aptitude · Chapter: Area · Exam: · Marks: · Difficulty:
The diameter of a cycle wheel is 70 cm . A cyclist takes 30 hours to reach a destination at the speed of 22 km/hr. How many revolutions will the wheel make during this journey?
(a)3 lakh
(b)4 lakh
(c)30 million
(d)None of these
Answer
Answer (as printed): A
Explanation
Distance covered in 1 revolution $=\left(2 \times \frac{22}{7} \times 35\right) \mathrm{cm}=220 \mathrm{cm}$. Total distance covered by the wheel $=(22 \times 30) \mathrm{km}=660 \mathrm{km}$. ∴ Number of revolutions made by the wheel $$=\left(\frac{660 \times 1000 \times 100}{220}\right)=300000 .$$