The answer depends on what the 30 metres refers to.
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30 meters
It is: 15 meters by 30 meters
Length of rectangle: 240/15 = 16 meters
It is: 9*8 = 72 square meters
If the width is 6 meters, two of the sides are 6 meters each. Therefore the sum of the other two sides is (30 - 2 * 6) meters or 18 meters. So one of the other sides is half of that, 9 meters. Then, of course, the area is the product of the width and the length.