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An automobile has two punctured tyres. The first puncture by itself would make the tyre flat in 10 minutes. The second puncture by itself would make the tyre flat in 5 minutes. How long would it take for both punctures together to make the remaining tyre flat ?
4 minutes
5 minutes
25 minutes
15 minutes
2 1/3 minutes
Read Solution (Total 2)
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- In 1 minute, tyre flat = 1 / 10 ——– Puncture (I)
In 1 minute, tyre flat = 1 / 5 ——– puncture (II)
Together 1 / 10 + 1 / 5 = 3 / 10 in 1 minute
Remaining = 7 / 10
= 7 / 10 * 10 / 3 = 7 / 3
= 2 1/ 3 minutes - 13 years agoHelpfull: Yes(8) No(8)
- None of these.
It will take 1/(1/10 +1/5) = 10/3 minutes = 3 1/3 mins
If time between two punctures is given, then answer can be different. - 13 years agoHelpfull: Yes(4) No(3)
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