The sum of the two shortest sides of a triangle must be greater than length of the longest side .one side of triangle abc measures 8cm .the longest side of triangle abc measure 14 cm

Pls! does anybody know a shortcut for answering these types of questions in the future?

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?