alleryA 180 m train enters a 420 m tunnel at 20 m/s. Time to clear it fully?
A24 s
B30 s
C21 s
D36 s
Answer & Solution
Correct answer: B. 30 s
The train must travel 180 + 420 = 600 m to clear the tunnel, taking 600 ÷ 20 = 30 seconds.
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