The line parallel to the BC of the triangle ABC divides the other two sides at the point D and E in such a way that AB = 3AD. Calculate the ratio of DE and BC.

The line parallel to the BC of the triangle ABC divides the other two

1.	The line parallel to the BC of the triangle ABC divides the other two sides at the point D and E in such a way that AB = 3AD. Calculate the ratio of DE and BC.
A.	1 : 6
B.	1 : 4
C.	1 : 3
D.	3 : 1
Answer» D. 3 : 1