0.001s and 128Kb :)

...
for (i=0; i<num; i++)
    {
       scanf("%d:%d", &min, &sec);
       if (min==0 && sec<7) continue;
       if (sec != 0)
          min += 1;
       basic_price += min*basic_pm;
       min_all += min;
    }
...

p.s.: HF & GL, it's very easy

I wrote analogous solution by myself with a bit different cycles, but now it gets WA#6, not AC :(

thx AC