Consider the portion of a project depicted by this graph: 
What is the latest start time of activity 6-7 if the latest finish of activity 7-8 is 26, and the latest finish of activity 7-9 is 23?
Definitions:
PCR
Polymerase Chain Reaction, a biotechnological method used to amplify specific segments of DNA, facilitating their analysis and manipulation.
Amplified DNA
Refers to DNA that has been increased in quantity through various laboratory techniques, often for study or diagnostic purposes.
Contaminated
The presence of unwanted substances, pollutants, or microorganisms in a material, environment, or substance, making it unsafe or unfit for its intended use.
Electrophoresis
Electrophoresis is a laboratory technique used to separate DNA, RNA, or protein molecules based on their size and charge by applying an electric field.
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