This Application Problem is a part of the Lesson 13, Unit 3, Grade 5. How much farther did Mark jog than his sister? Remind students to approach the problem with the RDW strategy. This is a very brief Application Problem. While circulating as students work, quickly assess which work to select for a short two- or three-minute Debrief. Students solve this Application Problem involving addition and subtraction of fractions greater than 2 and having unlike denominators, using visual models.