Subject
Bank Exam
Topic
Joint Recruitment Test for 8 Banks (SO) [03-09-2019, AUST
[ Read the following questions carefully and choose the right answer. ]A motor-cycle covers 40km with a speed of 20 km/hr. Find the speed of the motor-cycle for the next 40km journey so that the average speed of the whole journey will be 30km/hr.
[ Read the following questions carefully and choose the right answer. ]A motor-cycle covers 40km with a speed of 20 km/hr. Find the speed of the motor-cycle for the next 40km journey so that the average speed of the whole journey will be 30km/hr.
ক)
70 km/hr.খ)
52.5 km/hr.গ)
60 km/hr.ঘ)
60.5 km/hr.Explanation
প্রশ্নে বলা হচ্ছে, একটি মোটর সাইকেল 20 kmph বেগে 40 km পথ অতিক্রম করে । পুরো ভ্রমণে ঐ মোটর সাইকেল আরোহী গড়ে 30 kmph বেগে চললে পরবর্তী 40 km পথ অতিক্রমে তিনি কত kmph বেগে গিয়েছেন ? আমরা জানি, গড় গতিবেগ = 2xy/x+y এখানে, x = যাওয়ার বেগ এবং y = আসার বেগ বা পরবর্তী অংশ যাওয়ার বেগ প্রশ্নমনে, 30 = 2×20×y/20+y => 40y = 30(20+y) => 40y = 600+30y => 40y-30y = 600 => 10y =600 => y = 600/10 y = 60 km/hr.Related questions
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