Subject
Bank Exam
Topic
UCBL Bank Ltd. - Management Trainee Officer - 2017
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is -
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is -
ক)
36খ)
45গ)
48ঘ)
49ঙ)
None of theseExplanation
অনুবাদঃ দুটি ট্রেন পরপর বিপরীত দিকে যথাক্রমে 60 km/hr এবং 90 km/hr বেগে চলছে । তাদের দৈর্ঘ্য যথাক্রমে 1.10 km এবং 0.9 km. প্রশ্ন হলো Slower ট্রেন কর্তৃক Faster ট্রেনের অতিক্রম করতে কত সময় লাগবে ? যেহেতু, ট্রেন দুটি বিপরীত দিকে চলছে । তাই আপেক্ষিক গতি = 60 + 90 = 150 km/hr = m/s আর ট্রেন দুইটি একে অপরকে অতিক্রম করতে উভয়েই তাদের দৈর্ঘ্যের সমান দূরত্ব অতিক্রম করবে বলে তাদের অতিক্রান্ত মোট দূরত্ব = (1.1+0.9) = 2 Km = 2000 মিটার প্রয়োজনীয় সময় = = 48 সেকেন্ড । ** Alternative: Relative speed : (60 + 90) km/hr = m/sec = m/sec Distance Covered: (1.10 + 0.9) km = 2 km = 2000 m. Time = Distance/speed: 2000 sec 2000 = 48 sec Shortcut: Time = Distance/Speed = 2 hour/150 hour = = 48 সেকেন্ড ।Related questions
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