Answer:
1/4
Explanation:
 we know that the lines A and B are parallel. 
 The term "parallel" implies that they will never meet each other, and to do so, the lines must have the same slope. 
 So the slope of line A is the same as line B (as for all parallel lines have the same slope) 
So the slope of line B is also 1/4 
 
Hope it helped!!!