A black car chases at 160 km / h after a white car speeding at 120 km / h. At the initial moment, the distance between

A black car chases at 160 km / h after a white car speeding at 120 km / h. At the initial moment, the distance between them is 100 km. When the white car drove 80 km, a black cat ran across the road. The driver stopped the car and stood indecisively for 20 minutes, after which he continued to move at the same speed. How long after the appearance of the black cat black will the car catch up with the white one?

1. Formulas that we will use:
S1 = V1 * t;
S2 = V2 * t – 100;
2. Table with values:

t, min S1, km S2, km 0 0 – 100 10 20 – 73.33 20 40 – 46.67 30 60 – 20.00 40 80 6.67 50 80 33.33 60 80 60.00 70 100 86.67 80 120 113.33 90 140 140.00 100 160 166.67 110 180 193.33 120 200 220.00