The question gives us:

4x plus 50 plus x = 180

5x = 130

x = 26

Well done! I like the way you turned what the question gave you into an equation. That takes skill!

]]>The question gives us the sum 4x 50 x=[range difference] where x is the unknown, or 4x 50 x=180

therefore:

5x=130

x=26

The time is 26 minutes to 6.

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