public static void main ( String [ ] args ) {
  InputStream inputStream = System . in ;
  OutputStream outputStream = System . out ;
  InputReader in = new InputReader ( inputStream ) ;
  PrintWriter out = new PrintWriter ( outputStream ) ;
  int t = in . nextInt ( ) ;
  while ( t -- > 0 ) {
    int n = in . nextInt ( ) ;
    int m = in . nextInt ( ) ;
    int k = in . nextInt ( ) ;
    int z = n / k ;
    if ( z >= m ) out . println ( m ) ;
    else {
      int rem = m - z ;
      int i = 1 ;
      while ( i * ( k - 1 ) < rem ) {
        i ++ ;
      }
      if ( i < z ) out . println ( z - i ) ;
      else out . println ( 0 ) ;
    }
  }
  out . close ( ) ;
}

public static void main ( String [ ] args ) { InputStream inputStream = System . in ; OutputStream outputStream = System . out ; InputReader in = new InputReader ( inputStream ) ; PrintWriter out = new PrintWriter ( outputStream ) ; int t = in . nextInt ( ) ; while ( t -- > 0 ) { int n = in . nextInt ( ) ; int m = in . nextInt ( ) ; int k = in . nextInt ( ) ; int z = n / k ; if ( z >= m ) out . println ( m ) ; else { int rem = m - z ; int i = 1 ; while ( i * ( k - 1 ) < rem ) { i ++ ; } if ( i < z ) out . println ( z - i ) ; else out . println ( 0 ) ; } } out . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (identifier))) body: (block (expression_statement (update_expression (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))