The first question, four kinds, is 0:3, 1:2, 2: 1, 3:0 respectively.

Second, the distance the dog runs is equal to time x speed.

The time is 100÷(6+4)= 10, and the time is 1m per second, (1m? Is it a wrong number? 10 meter)

If the speed is 10 meter per second, then a * * * runs 100 meter.