Stuck! Need hint

#1

I require hints for the portion of the problem that involves calculating the required number of painters for the given time

#2

for a given time iterate over the array of boards each time incrementing the time according to the length of board and the painting time of the painter if the painting time exceeds the given time move on to next painter.

#3

My answer is coming out to be 55 instead of 50 for the given test case. Pls check