Each whole number in the second sequence is $$5$$ more than the corresponding number in the first sequence. We have $$280 +5 \times5 = 305$$. 
The sum of five consecutive whole numbers is $$280$$. What is the sum of the next five consecutive whole numbers? 

a. $$285$$ 
b. $$305$$ 
c. $$405$$ 
d. $$425$$ 