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Question 72
The wheels of bicycles A and B have radii 30 cm and 40 cm, respectively. While traveling a certain distance, each wheel of A required 5000 more revolutions than each wheel of B. If bicycle B traveled this distance in 45 minutes, then its speed, in km per hour, was
Solution
Distance covered by A in 1 revolution = 2$$\pi\ $$*30 = 60$$\pi\ $$
Distance covered by B in 1 revolution = 2$$\pi\ $$*40 = 80$$\pi\ $$
Now, (5000+n)60$$\pi\ $$ = 80$$\pi\ $$n
=> 15000= 4n-3n =>n=15000
Then distance travelled by B = 15000*80$$\pi\ $$ cm = 12$$\pi\ $$ km
Hence, the speed = $$\ \frac{\ 12\pi\times\ 60\ }{45}$$ = 16$$\pi\ $$
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