Puzzles
Q1 . A man smokes a cigarette of length 6 cm (Butt size not included). It takes him 2 seconds to take one puff and his inhaling capacity burns 3 mm of cigarette in one puff. After taking a puff he rests for some time and takes another puff. Even if he does not smoke the air has the capacity to burn 1 mm in 1 second. He completes his cigarette in 30 seconds. How many puffs he takes in completing one cigarette. (Assume that he completes the cigarette with a complete puff)
{A}12
{B}15
{C}10
{D}None of the above.
{E}Cannot be determined.
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Ans: {D} None of the above.
Explanation:
Lets assume that option {A} is correct. i.e 12 puffs.
Therefore total time taken for 12 puffs is 24 sec (2 sec = 1 puff) and the burn would be 12*3 = 36 mm of the cigratte.
Now for the remaining 6 sec (30 - 24), the air burns 6 mm of cigratte (1 sec = 1 mm burn)
Summing up the burns we get : 36 mm + 6 mm = 42 mm
But the cigratte length is 60 mm hence {A} is incorrect.
Similarly for {B} 15 puff
we get 45 mm of burn with nothing left for the air.(1 puff = 2 sec)
Similarly for {C} 10 puff
we get 30 mm of burn with puff and 10 mm of burn with air i.e 40mm
Although Durgendu is right to a certain extent, he over analyzed things like many programmers, the text doesn’t mention he takes more than 2 puffs!
“After taking a puff he rests for some time and takes another puff”.
So the real answer is he takes 2 puffs!
Oh and i forgot to mention that its impossible to complete a 6cm cigarette under 30 seconds. He can only take a maximum of 15 puffs at 3mm each which is still under 6cm.
Upon further analysis, lol. My answer is 15 IF a puff includes the passive 1mm burn time on top of the 3mm burn.
15 puffs !