Is it correct to say these sentences?
1. I come in an hour and a half.
2. in a half hour I am/will be here.
3. in half an hour I am/will be here .

hour and a half-90 min ?
and
half an hour- 30 min ?

I know that my question is stupid but I am not certain about this issue.

Question

Is it correct to say these sentences?
1. I come in an hour and a half.
2. in a half hour I am/will be here.
3. in half an hour I am/will be here .

hour and a half-90 min ?
and
half an hour- 30 min ?

I know that my question is stupid but I am not certain about this issue.

Answer

Dear Eliot, half an hour is 30 minutes. And your answer is much more stupid than his question

Lewis Green:
1. I will come in an hour and a half.
2. In a half an hour I will be here.

An hour and a half is 90 minutes ^__^

Answer

You are right on both counts. Your question is stupid. And yes, half an hour is 20 minutes, and an hour and a half is 90 minutes.