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Two trains start 100 km apart, speeds 40 and 60 km/h toward each other.
When they meet, how far has a fly flying at 80 km/h traveled?
Answer
80 km (meets in 1 h)
Explanation
Trains meet in (100/(40+60)=1) h; fly at 80 km/h for 1 h → 80 km.
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