How are you my friend in Hindi?

You can say "तुम कैसे हो मेरे दोस्त?" (Tum kaise ho mere dost?)

This translates to "How are you my friend?".

Here's a breakdown:

* तुम (Tum): You (informal)

* कैसे (Kaise): How

* हो (Ho): Are

* मेरे (Mere): My

* दोस्त (Dost): Friend

You can also say "आप कैसे हैं मेरे दोस्त?" (Aap kaise hain mere dost?) which is more formal and uses the respectful "aap" instead of "tum".