David W. answered 06/23/15
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retired
There are 6 hours between lunch and dinner (6pm - 12 noon).
If it has been T hours since lunch and it will be twice as long (2*T) until dinner. So, we have:
3*T = 6 (divide both sides by 3)
T = 2 (2 hours since 12 noon)
At 2 pm, it is twice as long until dinner (4 hours until 6 pm) than it has been since lunch (2 hours since 12 noon).
David W.
06/23/15