How can we tell? Look at the vertical lines inside the box. This is where the median is located. For movie A, the inner vertical line is somewhere between 30 and 40 (perhaps 35 or so). So this is the median for movie A. Meanwhile, the median for movie B is somewhere between 40 and 50. I'd say maybe 46 or 47 as its a bit higher than the halfway point.
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Extra info:
The left edge of the box is the first quartile (Q1).
The right edge of the box is the third quartile (Q3).
The tip of the left whisker is the min value, assuming there are no outliers to the left.
The tip of the right whisker is the max value, assuming there are no outliers to the right.
