What does Kant mean when he says that morality requires us to treat humanity as an end and never as a mere means

What does Kant mean when he says that morality requires us to treat humanity as an end and never as a mere means

1- What does Kant mean when he says that morality requires us to treat humanity as an end and never as a mere means? Give examples of treating humanity as a mere means and then as an end in itself. (250 words)

2- What is the difference between a hypothetical and a categorical imperative? Which kind of imperative does morality involve and why? (250 words)

3- According to Kant, it is impossible to have conflicting moral duties? Can you think of a counter-example to this claim – a case where 2 or more moral duties are somehow in conflict? How should such conflicts be resolved? (100 words)