tcs - a chocolate maker has to make 25 pieces each of length 3cm from a square shaped bar of length 75cm if he takes 5 seconds to cut a single piecethen the timeseconds taken to make 25 pieces is - skillgun

From one cut on the square bar we will get 2 pieces.
Then the total number of cuts to make 25 pieces = 25 - 1 = 24
(i.e At 24th cut we have 25 pieces)
Given that the time taken to cut a single piece is 5 seconds.
Then the time to taken to make 25 pieces = 24 x 5 = 120 seconds.
(Most of us would have answered wrongly assuming 25 x 5 = 125 seconds!)
Hence the answer is option b.