Question

Four friends are invited to a party . Jim is a quarter of an hour late , Jack was half of a quarter late , Helen is half an hour late and Ann is only ten minutes late ,
Who arrives the earliest ?


a) Jack b) Jim c) Helen d) Ann

Answer 1

$\rm A~quarter~of~an~hour~\to~un~sfert~de~ora~\to~60:4=15~min~(Jim). \\ \\ Half~of~a~quarter~\to~jumatate~de~sfert~\to~60:4:2=7,5~min~(Jack). \\ \\ Half~an~hour~\to~jumatate~de~ora~\to~60:2=30~min~(Helen). \\ \\ Ten~minutes~\to~10~min~(Ana). \\ \\ Deci~raspunsul~este~\boxed{\rm a}.$