Dan can dig a hole in 50min, Jon can do it in 40min, how long will it take if they work together?

How to solve an algebra work word problem. TabletClass Math Academy Help with Middle and High School Math Test Prep for High School Math, College Math, Teacher Certification Math and More! All Courses - https://TCMathAcademy.com/ ✓Help with Middle and High School Math (Public/Private Schools) ✓High School & College Math Test Prep ✓Teacher Certification Math Test Prep ✓Homeschool Math Program and Courses for Pre-Algebra, Algebra 1, Geometry, Algebra 2 and Pre-Calculus. Popular Math Courses: Math Foundations https://tabletclass-academy.teachable.com/p/foundations-math-course Pre-Algebra https://tabletclass-academy.teachable.com/p/tabletclass-math-pre-algebra1 Algebra https://tabletclass-academy.teachable.com/p/tabletclass-math-algebra1 Geometry https://tabletclass-academy.teachable.com/p/tabletclass-math-geometry1 Algebra 2 https://tabletclass-academy.teachable.com/p/tabletclass-math-algebra-21 Pre-Calculus https://tabletclass-academy.teachable.com/p/tabletclass-math-pre-calculus