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Distance + distance = 315 miles
3*x + 3*(x+25) = 315 miles (<<<---=== x is the rate of the slower train)
3x + 3x + 75 = 315
6x + 75 = 315 ====> 6x = 315 - 75 = 240 ====> x = = 40.
Answer. Freight train rate is 40 mph. Passenger train rate is 40 + 25 = 65 mph.
Solved.
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