Error encountered when compairing data (slowest car &fastest car). Both code(slowest car &fastest car) but only the "fastest" can function

I had made a program which calculate and store data in form of array structure,and at the end of the code, I will find the car plate with slowest speed and greatest speed.BUT I encountered a weird output for the "find the slowest car section".

it shows somethings like this Slowest speed = 0.000000 Car = 6954000

Fastest speed = 300.000000 Car = 13 Process returned 9 (0x9) execution time : 24.881 s Press any key to continue.

//it is weird cuz the "fastest" can work but the slowest just cant//

#include <stdio.h>

struct Car
{
    int plate;
    float time,distance,speed;

};

int main ()
{
    int n;
    struct Car car[10];
    int fcar,scar;
    for (n=1;n<=10;n++){

        printf ("\nPlate = ");
        scanf("%d",&car[n].plate);

        printf ("Distance = ");
        scanf("%f",&car[n].distance);

        printf ("Time = ");
        scanf("%f",&car[n].time);

        (car[n].speed) = (car[n].distance)/(car[n].time);
        printf ("Speed = %f",car[n].speed);
//-----------------------------------------------------------------//
        if (car[n].speed< 70){
            printf("\nSlow\n");

        }else if (car[n].speed>=70 && car[n].speed<110){
            printf("\nNormal\n");

        }else{
            printf("\nFast\n");

        }

        printf("-----------------------------------------------------");
    }


    float minn = car[0].speed;
    for (n=1;n<=10;n++){
        if ( car[n].speed < minn){
            minn = car[n].speed;
            scar = car[n].plate;
        }
    }
   printf("\n\nSlowest speed = %f",minn);
    printf("\nCar = %d",scar);

    float maxx = car[0].speed;
    for (n=1;n<=10;n++){
        if ( car[n].speed > maxx){
            maxx = car[n].speed;
            fcar = car[n].plate;
        }
    }
   printf("\n\nFastest speed = %f",maxx);
    printf("\nCar = %d",fcar);




    }

//-------------------------------