Trick Maths Riddle

Trick Maths Riddle Solution - 8 February

I have a role of cloth 1km long.
I have a machine which cuts this role 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 ?

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396 seconds

1000m would only take 99 cuts not 100.
so 4*99 => 396