A) 250
B) 520
C) 420
D) 350
Correct Answer: D
Solution :
| In 1 h, distance covered by wheel = 33 km |
| In 1 min, distance covered by wheel |
| \[=\frac{33\times 1000}{60}m=550\,m\] |
| Now, number of revolutions made in 1 min |
| \[=\frac{Distance\text{ }covered\text{ }by\text{ }wheel}{Circumference\text{ }of\text{ }the\text{ }wheel}\] |
| \[=\frac{550}{2\times \frac{22}{7}\times \frac{25}{100}}\] |
| \[\left[ \because \,\,\,25cm=\frac{25}{100}\,m \right]\] |
| \[=\frac{550\times 7\times 100}{2\times 22\times 25}=350\] |
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