Describe a real world situation that can be modeled by 5t

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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

Me find the value of x each figure.