The Salvadoran Government opened critical talks here today with guerrilla representatives by proposing an end to all hostilities in two days and the demobilization of the rebels in three months.

Departure to U.S. Delayed Mr. Duarte then delayed his departure for three days in order to meet with virtually every important group in the country except leftist guerrilla representatives, his friends said.

Negotiations between Nicaraguan Government and guerrilla representatives were suspended today by the official mediator, who said the two sides remained too far apart to have meaningful talks.

He asserted that the meetings between the Soviet Union and guerrilla representatives came as a result of longstanding contacts among Afghans on both sides.

The Khmer Rouge has insisted that guerrilla representatives outnumber Government representatives in the pre-election Supreme National Council, a proposal Mr. Hun Sen has dismissed as out of hand.

It also agreed to hold a second round of talks with guerrilla representatives next week in the Dominican Republic.

Militia officials met with Palestinian guerrilla representatives in an effort to find Mr. Winkler and obtain his release, a militia spokesman said.

A10 Afghanistan's Prime Minister urged the United States and Pakistan to support a coalition Government that would involve "moderates," guerrilla representatives and leaders of the pro-Soviet ruling party.

The two guerrilla representatives at the meeting made a proposal for the release of four Soviet soldiers held by the rebels.

Mr. Mandela attended the opening of the conference to assure the guerrilla representatives that their military organization still had a role to play, despite Congress's suspension of the armed struggle a year ago.