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How long will the train in the figure take to cross the platform completely?

Competition practiceProblems on Trains

A24 s
B20 s
C12 s
D8 s

Step-by-Step Solution

Distance = train + platform =

120 + 180 = 300

m. Speed =

54 \times \frac{5}{18} = 15

m/s. Time =

\frac{300}{15} = 20

s. (Using only the platform gives 12 s.)

Answer: B) 20 s

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