[Zimon95]

For the distance you can use this function (I took it from LA:RP script)

pawn Код:

public Float:GetDistanceBetweenPlayers(playerid1,playerid2)
{
    new Float:x1,Float:y1,Float:z1,Float:x2,Float:y2,Float:z2;
    if(!IsPlayerConnected(playerid1) || !IsPlayerConnected(playerid2))
    {
        return -1.00;
    }
    GetPlayerPos(playerid1,x1,y1,z1);
    GetPlayerPos(playerid2,x2,y2,z2);
    return floatsqroot(floatpower(floatabs(floatsub(x2,x1)),2)+floatpower(floatabs(floatsub(y2,y1)),2)+floatpower(floatabs(floatsub(z2,z1)),2));
}

That is, as Nero_3D said, the Pythagorean theorem.