RS Aggarwal Solutions for Class 8 Chapter 13 covers Concept of “Time and Work”, the basic concept of Time and Work is similar to that across all Arithmetic topics, i.e. the Concept of Proportionality. Efficiency is inversely proportional to the Time taken when the amount of work done is constant as the Chapter is about Time and Work. Here are some instances where we come across, we use them in calculating the distance, speed and Time. For example, ‘x’ men required to complete a piece of work at a specified time.