long time = 0;
float hours = 0;
float km =0;
float speed = 0;

void setup() {
  Serial.begin(115200);
  pinMode(5, INPUT);   //THE red BUTTON
  pinMode(6, INPUT);   //THE green BUTTON
  pinMode(3, OUTPUT);  //RED PIN
  pinMode(2, OUTPUT);  //GREEN PIN
  pinMode(1, OUTPUT);  //BLUE PIN
}

void loop() {
  if (digitalRead(5) == HIGH) {
    while(digitalRead(5) == HIGH){
      delay(1);
    }

    Serial.println("button pressed, timer is:");
    Serial.println(micros()-time);
    Serial.print((micros()-time)/1000000.0);
     Serial.println("seconds");
     time = micros();
     hours = time / 1000 / 60 / 60; //we are dividing by 1000 to get second
                                    // again dividing by 60 to get minutes
                                    // again dividint by 60 to get hours
    km = 1 / 1000;      // 
    speed = km / hours; //
    
  }
}