book Maths Puzzle Numerical Ability

Four Ladiess are waiting to cross a bridge at night. They can only cross the bridge 2 at a time and they must carry a lantern over and back or they will not be able to see. Lady A

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3(t-8) + 2t = 7 + t can you help solve not sure if my answeris correct I came up with t= 31/4 or 7 and 3/4 The width of a rectangle is 4 feet less than the length. The area is 320ft^2. Find the width of the rectangle.
___feet
Thank you