Jun can paint a room in 4 hours and Arnold can do it in 7 hours. What part of the job they do by working for x hours?

Question

Jun can paint a room in 4 hours and Arnold can do it in 7 hours. What part of the job they do by working for x hours?
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Solution 1

Jun can paint a room in 4 hours, which means he can paint 1/4 of the room in 1 hour. Similarly, Arnold can paint a room in 7 hours, which means he can paint 1/7 of the room in 1 hour.

When they work together, their combined rate of work is (1/4 + 1/7) rooms per hour. This simplifies to 11/28 rooms Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study prob

Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solve study problem.
Knowee AI StudyGPT is a powerful AI-powered study tool designed to help you to solv

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