- A462 m
- B420 m
- C840 m
- D400 m
Step-by-Step Solution
72 km/h /s. In 42 s it covers = train + bridge, so bridge forgets the train's length.)
Answer: B) 420 m
A train 420 m long needs 42 seconds to clear a bridge at 72 km/h. How long is the bridge?
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