First, let's simplify each fraction:

1/17/25 = 1/425

2/1/7 = 2/7

2/4/7 = 2/28 = 1/14

1/2/5 = 1/10

Now, let's substitute the simplified fractions into the original expression:

(1/425) (2/7 - 1/14) (1/10)

Next, let's simplify the expression inside the parentheses:

(2/7 - 1/14) = (4/14 - 1/14) = 3/14

Now, we have:

(1/425) (3/14) (1/10)

Multiplying the fractions:

(1/425) (3/14) (1/10) = 3/5950

Therefore, the expression simplifies to 3/5950.