alleryA 180 m ট্রেন একটি 420 m টানেলে 20 m/s এ প্রবেশ করে। এটি সম্পূর্ণরূপে পরিষ্কার করার সময়?
A24 s
B30 s
C21 s
D36 s
Answer & Solution
Correct answer: B. 30 s
টানেল পরিষ্কার করতে ট্রেনটিকে অবশ্যই 180 + 420 = 600 মিটার যেতে হবে, 600 ÷ 20 = 30 সেকেন্ড সময় লাগবে।
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