An industrial manufacturing cell operates a high-precision 3D printer to fabricate custom titanium implants. The stages required to produce a single batch of implants are listed in the table below.
| Process Stage | Duration in minutes |
|---|---|
| Chamber pre-heat and vacuum pump down | 11 |
| Direct metal laser sintering (DMLS) | 24 |
| Inert gas cooling phase | 8 |
| Ultrasonic debris removal | 4 |
| Extraction and chamber vacuuming | 3 |
At the end of each week, the sintering machine must undergo a comprehensive powder sieving and filter replacement procedure. This maintenance takes 90 minutes.
Construct a general expression to show how many batches of implants can be fabricated in any number of hours (hhh).
159 exam-style questions on Edexcel GCSE Computer Science Algorithms, covering Constructs for solving problems, Variables, constants and data structures, Arithmetic, relational and logical operators, Tracing algorithm output with trace tables, Types of error and correcting logic errors, Standard algorithms (sorts and searches), and Evaluating algorithm fitness and efficiency. Each one has a worked solution and a mark scheme showing where the marks go.