The diameter of a cycle wheel is 126 cm. A cyclist takes 33/2 minutes to reach the destination at a speed of 72 km/hr. How many revolutions will the wheel make during the journey? ( take π=22/7 )
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 5000
| Understanding | Application |
| Tricks |
Total distance covered 72 km in 60 min So in 33/2 min = 72/60 × 33/2 = 19.8 km in cm 1980000 cm |
| Now |
covered distance in a cycle of the wheel 2πr 2 × 22/7 × 63 = 396 |
| Hence |
Number of revolutions = 1980000/396 = 5000 |