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Two trains 120 miles apart travel towards each other. The 1st train travels at 70 mph while the 2nd at 50 mph. A bird starts flying from the location of the faster train towards the other train at 85 mph and when it reaches the slower train it turns back and flies in the other direction at the same speed. When it reaches the faster train it again turns around and repeats the same procedure again and again. When the train collide, how far will the bird have flown?

Correct answer: A. 85 miles

  • A. 85 miles
  • B. 70 miles
  • C. 50 miles
  • D. 120 miles

Explanation

The trains approach each other at 70 mph + 50 mph = 120 mph, so they collide after 120 miles ÷ 120 mph = 1 hour. The bird flies for the full 1 hour at 85 mph, covering 85 mph x 1 h = 85 miles; 120 miles confuses the trains' separation with the bird's distance.

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