Write an addition equation with a positive addend and a negative addend and a resulting sum of -8

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

Write and solve a real word problem that involves determining distance on a coordinate plane

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m