```Question 549899
The 1st train has a head start of
{{{ 80*3 = 240 }}} mi
Start a stopwatch when the 2nd train leaves
Let {{{d}}} = distance 2nd train goes until they meet
Let {{{t}}} = time on stopwatch when they meet
---------------
2nd train:
{{{ d = 100t }}}
1st train:
{{{ d - 240 = 80t }}}
-----------------
By substitution,
{{{ 100t - 240 = 80t }}}
{{{ 20t = 240 }}}
{{{ t = 12 }}}
This is 12 hrs after the 2nd train leaves at 6 PM + 3 = 9 PM
The 2nd train catches up with the 1st train at 9 AM the next day
-----------------
The passage describes a word problem involving two trains, their speeds, and the time it takes for the second train to catch up with the first train, which has a head start. The solution to the problem is provided, including the time at which the second train catches up.
single_question_with_answer
Given a text passage, determine:
    1. If it contains a mathematical question (including word problems or calculations)
    2. If an answer to that mathematical question is provided in the text

First, describe the content structure you found in 1-2 sentences.

Then provide your analysis in the following format:
TYPE: <one of the following values>
- NO_QUESTION
- SINGLE_QUESTION
- SINGLE_QUESTION_WITH_ANSWER
- MULTIPLE_QUESTIONS
- MULTIPLE_QUESTIONS_WITH_ANSWERS
system
```Question 549899
The 1st train has a head start of
{{{ 80*3 = 240 }}} mi
Start a stopwatch when the 2nd train leaves
Let {{{d}}} = distance 2nd train goes until they meet
Let {{{t}}} = time on stopwatch when they meet
---------------
2nd train:
{{{ d = 100t }}}
1st train:
{{{ d - 240 = 80t }}}
-----------------
By substitution,
{{{ 100t - 240 = 80t }}}
{{{ 20t = 240 }}}
{{{ t = 12 }}}
This is 12 hrs after the 2nd train leaves at 6 PM + 3 = 9 PM
The 2nd train catches up with the 1st train at 9 AM the next day
-----------------
user
The passage describes a word problem involving two trains, their speeds, and the time it takes for the second train to catch up with the first train, which has a head start. The solution to the problem is provided, including the time at which the second train catches up.

TYPE: SINGLE_QUESTION_WITH_ANSWER