Question 157769
    A train leaves the station at 6p traveling west, going 80 miles per hour on a parallel track,a second train leaves the station three hours later traveling west at 100 miles and hour, at what time will the second train catch up with the first? 
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You will have to apply the "distance formula"
d = rt
where
d is distance
r is rate or speed
t is time
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Let x = time it will take for second train to catch up
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For the trains to catch up, the distance traveled by both must be the same:
"distance traveled by 1st train" = "distance traveled by 2nd train"
80(t+3) = 100t
80t+240 = 100t
240 = 20t
12 hours = t
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Conclusion:
12 hours after 6pm is 6am
Answer: 6 A.M.