Subject
Quantitative Aptitude
Topic
Speed & Distance
An aeroplane flies twice as fast as a train which covers 60 miles in 80 minutes .What distance will the aeroplane cover in 20 minutes?
An aeroplane flies twice as fast as a train which covers 60 miles in 80 minutes .What distance will the aeroplane cover in 20 minutes?
ক)
30 milesখ)
33 milesগ)
35 milesঘ)
37 milesExplanation
(প্রশ্ন-একটি বিমান একটি ট্রেনের দ্বিগুণ গতিতে ভ্রমন করে।ট্রেনটি ৮০ মিনিটে ৬০ মাইল দূরত্ব অতিক্রম করে।তাহলে বিমানটি ২০ মিনিটে কতটুকু দূরত্ব অতিক্রম করবে?) ৬০ মাইল অতিক্রম করতে সময় লাগে =৮০ মিনিট =৮০/৬০ =৪/৩ ঘন্টা অতএব ট্রেনের গতি =৬০/(৪/৩) =৬০×(৩/৪) =৪৫ mph [ গতি=দূরত্ব/সময় ] বিমানের গতি =(৪৫×২)=৯০ mph বিমানটি ৬০ মিনিটে দূরত্ব অতিক্রম করে =৯০ মাইল অতএব বিমানটি ২০ মিনিটে দূরত্ব অতিক্রম করবে =(৯০/৬০)×২০ মাইল =৩০ মাইলRelated questions
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