What happens when a state law conflicts with federal law?

Federal law will ALWAYS override state law. This is due to the supremacy clause.

The law (supremacy clause) that applies to situations where state and federal laws disagree is called the supremacy clause, which is part of article VI of the Constitution. The supremacy clause contains what's known as the doctrine of pre-emption, which says that the federal government wins in the case of conflicting legislation.

Here's an article to help you further:

https://m.huffpost.com/us/entry/us_4676579

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answer:

it's very crucial, and many factors of the crime scene can determine what happen during the crime.

answer: a. 3 to 5 seconds  

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