X/7 was used on the first day, leaving 6x/7.

The next day, (6x/7)* 1/6 was used, that is, x/7, leaving 1-x/7-x/7=5x/7.

On the third day, I used (5x/7)* 1/5, which is x/7, leaving 4x/7.

On the fourth day, I used (4x/7)* 1/4, which is x/7, leaving 3x/7.

By analogy, there is x/7 on the sixth day, that is, x/7= 120.

The first day and the second day used x/7, which is 2x/7, which is 240 tons of coal.

2. Set the whole journey to x meters.

According to the meaning of the question, 4x/5-3/5=x/4.

Solution, x= 12/ 1 1.