Cloth Roll to be Cut
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You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.
How long would it take for the machine to cut the roll if each cut took 4 secs? 
A one km long cloth will have 100 pieces of 10m each. To get 100 pieces, it requires 99 cuts, which will take, at 4 seconds per cut, 4 x 99 = 396 Sec. (6 min. 36 Sec.)
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