If Carly, Britney, and Lauren streamed one fourth of an eight-episode documentary, it means they watched (1/4) * 8 = 2 episodes of the documentary.
Since each episode is 70 minutes long, they watched a total of 2 * 70 = <<2*70=140>>140 minutes of the documentary.
Therefore, the documentary has a total of 140 + 70 = <<140+70=210>>210 minutes. Answer: \boxed{210}.
carly britney and lauren streamed one fourth of an eight epidode documentry if 70 minutes of the documentery have been watched how many miutes are i n the documenty
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1 answer