На сколько лет дольше живёт дуб, чем ель?

1. Find the lifespan of 'дуб' (oak) which is 1100 years.

2. Find the lifespan of 'ель' (spruce) which is 1000 years.

3. Calculate the difference: 1100 - 1000 = 100 years.

Answer: На 100 лет