Step 1: Understanding the Concept:
This question deals with the formation of a contract by post, specifically determining the place where the contract is concluded. This is governed by the "postal rule" or "mailbox rule" of contract law.
Step 2: Detailed Explanation:
According to Section 4 of the Indian Contract Act, 1872:
"The communication of an acceptance is complete,—
\textit{as against the proposer}, when it is put in a course of transmission to him, so as to be out of the power of the acceptor;
\textit{as against the acceptor}, when it comes to the knowledge of the proposer."
This means that the moment the acceptor posts the letter of acceptance, the contract is concluded as far as the proposer is concerned. The proposer becomes bound at this point.
The legal fiction is that the post office acts as the agent of the proposer. Therefore, delivering the acceptance to the post office is considered as delivering it to the proposer.
Consequently, the place of contract is the place where the acceptance is posted. The time of contract is the time when the letter of acceptance is posted.
The leading case on this is \textit{Adams v. Lindsell}.