Question 797597
Their distance between is DECREASING at {{{90-60=30}}} miles per hour.
The two trains begin 75 miles apart and the distance decreases 30 mph.  


In 2pm to 2:30pm, half hour passes, so {{{30*(1/2) (miles/hour)(hour)=15}}} miles decrease from the initial given 75; there fore {{{75-15=60}}} miles apart at 2:30pm.





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Required a bit of thought to sort through the details.