A rope cuts10m, and B rope cuts10m, so the two ropes are the same length.

So rope A is longer than rope B 10- 1 = 9m.

The length of rope a is four times that of rope B.

So the length of a rope is 9 ÷ (4- 1) × 4 = 12m.

The length of rope b is 9 ÷ (4- 1) × 1 = 3m.