Subject
Bank Exam
Topic
Joint Recruitment Test for 2 Banks (Officer)IT/ICT [04-01-2019, AUST]
A train of length 150m takes 10 seconds to cross another train 100m long coming from the opposite direction. If the speed of first train is 30 km/hr, what is the speed of second train ?
A train of length 150m takes 10 seconds to cross another train 100m long coming from the opposite direction. If the speed of first train is 30 km/hr, what is the speed of second train ?
ক)
48 km/hrখ)
54 km/hrগ)
60 km/hrঘ)
72 km/hrExplanation
প্রশ্নে বলা হচ্ছে যে, 150 মিটার দীর্ঘ একটি ট্রেন বিপরীত দিক হতে আসা 100 মিটার দীর্ঘ অপর একটি ট্রেনকে 10 সেকেন্ড অতিক্রম করে । প্রথম ট্রেনের গতিবেগ 30 kmph হলে অপর ট্রেনের গতিবেগ কত ? দেয়া আছে, প্রথম ট্রেনের দৈর্ঘ্য d 1 = 150 মিটার এবং দ্বিতীয় ট্রেনের দৈর্ঘ্য d 2 = 100 মিটার প্রথম ট্রেনের গতিবেগ v 1 = 30 kmph; দ্বিতীয় ট্রেনের গতিবেগ v 2 = ? এবং সময় t = 10 সেকেন্ড । যেহেতু বিপরীত অভিমুখী, তাই, t = d 1 +d 2 / v 1 +v 2 [ সূত্র ব্যবহার করতে হবে ] => 10 = 15+100/(30+v 2 )×(5/18) => 5/18 × 10 × (30+v 2 ) = 250 => 25(30+v 2 ) = 250×9 = 2,250 => 750 + 25v 2 = 2,250 => 25v 2 = 2,250 - 750 = 1,500 => v 2 = 1500/25 = 60 v 2 = 60 kmphRelated questions
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