Carol H. answered 09/26/17
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(time together)/(time alone) + (time together)(time alone) = 1
Let x = Nancy's time alone
Let 2x = Amy's time alone
50/x + 50/2x = 1 Multiply both sides of the equation by 2x.
100 + 50 = 2x
150 = 2x
75 minutes = x
2x = 150 minutes