Answers

2014-12-23T19:11:36+05:30
If both punctures together then take 216 sec. to flat the tyre
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2014-12-23T21:49:59+05:30
Rate of leak by first puncture is 1/6
                   by second puncture is 1/9
leak by both =1/6+1/9=5/18
time required to flat the tyre =1/(5/18)=18/5= 3 minutes 36 seconds
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