there are 2 punctures in a tyre.one take 6 mins to flat the tyre. the other takes 9 mins to flat the tyre. how many mins will both the punctures together take to flat the tyre?
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if both punctures together then take 216 sec. to flat the tyre
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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
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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