a) 70 ft/second
b) 85 ft/second
c) 100 ft/second
d) 120 ft/second
Answer: d
Explanation:
$$\eqalign{
& {\text{Speed of the train}} \cr
& {\text{ = }}\frac{{700 + 500}}{{10}} \cr
& {\text{ = 120 ft/second}} \cr} $$
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