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15. A train leaves the station traveling at 40 miles per
hour. A second train leaves the station traveling
at 60 miles per hour. The second train leaves the
station 2 hours after the first train leaves. Both
trains stop traveling 4 hours after the first train
left. Together, the two trains traveled how many
miles?
A. 160
B. 200
C. 240
D. 280
E. 400
(Please solve ?)