Four times 10 metres

#include "FastLED.h"
#include <SPI.h>
#define NumOfStrips 4
#define NumPixels 300
#define DataRate_Mhz 12
CRGB leds[NumOfStrips][NumPixels * NumOfStrips];

int g, r, b, t;
int head=-1, tail=(head-2);
int Speed, LEDInterval;
int previousmicros;

void setup()
{
 FastLED.addLeds<APA102,11,13, BGR,DATA_RATE_MHZ(DataRate_Mhz)>(leds[0],NumPixels);      //datapin is green, clockpin is blue
 FastLED.addLeds<APA102,7, 14, BGR,DATA_RATE_MHZ(DataRate_Mhz)>(leds[1],NumPixels); 
 FastLED.addLeds<APA102,7, 13, BGR,DATA_RATE_MHZ(DataRate_Mhz)>(leds[2],NumPixels);  
 FastLED.addLeds<APA102,11,14, BGR,DATA_RATE_MHZ(DataRate_Mhz)>(leds[3],NumPixels);  
 
 Serial.begin(115200);
 fill_solid(leds[0], NumPixels, CRGB(0,0,0));
 fill_solid(leds[1], NumPixels, CRGB(0,0,0));
 fill_solid(leds[2], NumPixels, CRGB(0,0,0));
 fill_solid(leds[3], NumPixels, CRGB(0,0,0)); 
 FastLED.show();
 delay(3000);
}

void loop() 
{
 Speed = 1.00*1000000, g=255, r=0, b=255;
 LEDInterval = (Speed/NumPixels);
  while(t<=NumOfStrips-1)
  {
   while(head<=NumPixels-1)
   {
    float currentmicros = micros();
    if(currentmicros-previousmicros>= LEDInterval)
    {
     Serial.print("Head Equals "); Serial.println(head);
     Serial.print("Interval Equals "); Serial.println(currentmicros-previousmicros);
     Serial.print("Time Equals "); Serial.println(micros());
     Serial.print("t Equals "); Serial.println(t);   
     Serial.println("");
     previousmicros = currentmicros;
     leds[t][head] = CRGB(g,r,b);           // head
     leds[t][tail] = CRGB(0,0,0);           // tail
     if(t>0) leds[t-1][tail] = CRGB(0,0,0); // tail for previous strip
     FastLED.show();                        // show
     if(tail>=NumPixels-1) tail=0;
     else(++tail);
     ++head;
    }
   }
   ++t;
   if(t<=NumOfStrips-1) head=0;
   else{head=9999;}

  }
}