Question
A can go round a circular path 8 times is 40 minutes . If the diameter of the circle is increased o 10 times the original diameter , then the time required by A to go round the new path once , travelling at the same speed as before is :
Answer: Option C
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Let original diameter be d meters. Then , its circumference = `(pi d)` metres.
Time taken to cover (8pi d) m = 40 min.
New diameter = (10d) m, Then , its circumference = `(pi xx 10d)m`
`:.` Time taken to go round it once = `((40)/(8pid) xx 10 pi d)` m = 50 min.
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