- A10:00:39
- B10:00:11
- C10:01:00
- D10:00:50
Step-by-Step Solution
Relative speed km/h m/s. The rear ends separate after covering m → 50 s → 10:00:50. (10:00:39 is roughly when the engines meet.)
Answer: D) 10:00:50
At 10:00:00 the engines of a 240 m train at 72 km/h and a 160 m train at 54 km/h, approaching each other on parallel tracks, are 1.35 km apart. At what time do the two trains finish crossing?
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