Question 1088378
{{{ (96/625)=highlight(0.1536km^2 )}}} 
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Workout:
2L + 2W = perimeter = (8/60hr) * 12km/hr = 8/5km   <—<<< perimeter

Also, we are given that  L/W = 3/2 —>  L=(3/2)W  
Plug in (3/2)W for L in the perimeter equation:

2(3/2)W + 2W = 8/5   —>  W=(8/25)km  —> L=(12/25)km

Area = L*W = (12/25)*(8/25) = 96/625km^2