Subject: mathqa
Question: when working alone , painter w can paint a room in 2 hours , and working alone , painter x can paint the same room in e hours . when the two painters work together and independently , they can paint the room in 3 / 4 of an hour . what is the value of e ?
Option: 
A: 1 [ 3 / 4 ]
B: 2
C: 3 / 4
D: 1 [ 1 / 5 ]
Answer: D