now, i woud like to hear american 17y/18y oles on how "hard" this problem is & how long it took them to solve 8b
( note : no "grown-ups" disparage efforts of youngsters, as it shoudn't take to solve 8b, more than the 1'39.9 that Ryun '67 was capable of on a '70s synthetic off perfect drafting to bell
i managed 8b in about 1'00 but i'm doing some maths teaching to young relatives & have been read "dummies" on precalculus / calculus 1 / calculus 2, so am "trained up", so that 1'00 is unfair to ask for most "grown-ups" )