XD I solved the problem .. I used TinyGPS + + library and a sample there, where we used a custom item .... that example is found in the examples
before void setup()...
// for speed in kilometers per hour
TinyGPSCustom zdop(gps, "GPVTG", 7); // $GPVTG sentence, 7th element
in main loop()..
// speed in km/h
Serial.print(" ");
Serial.print(zdop.value()); // is character string
// change the character in integer number
int vitesa1 = atoi (zdop.value());
Serial.print("/");
Serial.print(vitesa1);
Serial.println();