alleryA 180 m ट्रेन 420 m बोगद्यात 20 m/s वर प्रवेश करते. ते पूर्णपणे साफ करण्याची वेळ आली आहे?
A24 s
B30 s
C21 s
D36 s
Answer & Solution
Correct answer: B. 30 s
बोगदा साफ करण्यासाठी ट्रेनने 180 + 420 = 600 मीटर प्रवास केला पाहिजे, 600 ÷ 20 = 30 सेकंद लागतात.
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