Why start(minimum time required for the board) is 40

Why start(minimum time required for the board) is 40, why not 10, if a painter painting a board he can choose any of board to paint, if he select smallest board having 10 units, then minimum time would be 10.

so why he choose maximum board length (40) as start.

Hello @smrgrover2 no think like if there are number of painters equal to the numebr of boards then you can solve your task in the fastest time by allocating each baord to every painter to paint but in the case the time taken to paint the whole array will be 40 as the painter allocating the baord with dimenstion 40 will paint it in that time.
we will count the time for the whole boards of the array to paint.

Got the point, Thanks…

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