Example Henry can do a certain work alone in 5 hours. It takes John 8 hours to do the same work. If they work together, how long will it take them to do the work?

For such problems use-

Solving as

Therefore, it will take them hours of working together to do the same

work.

Example Two secretaries working together can type a large report in 2.4 hours. If either secretary had to type the report all alone, it would take the first one 2 hours longer than the second secretary. How long would it take each secretary to type the report?

Solution :

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Index

9.1 - Definition and Solving Techniques
9.2 - Use of Simultaneous Linear Equations

Chapter 1