Two random variables are uniformly distributed in $ [0, 1] $.

The question asks whether the smaller of the two numbers is strictly less than

$ frac {1} {4} $, then what is the probability that the largest is strictly greater than $ frac {3} {4} $.

I approached the issue while trying to find an appropriate area in the unit square. I have two lines that cut a small square of $ frac {1} {4} $ length, so I calculated the probability as $ frac {1} {16} $; but the answer given is $ frac {2} {7} $ and now I cannot understand where I am wrong.