Two trains, A and B, are moving at speeds of 60 km/h and 80 km/h respectively.…
2025
Two trains, A and B, are moving at speeds of 60 km/h and 80 km/h respectively. Train A crosses a platform that is 150 meters long in 15 seconds, while Train B crosses a pole in 18 seconds. What the sum of length of both trains A and B (in meters)?
- A.
320
- B.
160
- C.
420
- D.
400
- E.
500
Attempted by 15 students.
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Correct answer: E
Train A's speed is 60 km/h = 50/3 m/s. In 15 seconds it covers 250 m, so its length is 250 - 150 = 100 m. Train B's speed is 80 km/h = 200/9 m/s; crossing a pole in 18 seconds gives length 400 m. Sum = 500 m.