Subject
Quantitative Aptitude
Topic
Speed & Distance
Himanta travels a certain distance at the rate of 20 miles an hour and returns at the rate of 30 miles an hour. What is average speed of Himanta?
Himanta travels a certain distance at the rate of 20 miles an hour and returns at the rate of 30 miles an hour. What is average speed of Himanta?
ক)
26খ)
24গ)
53ঘ)
21Explanation
QUESTION : একজন ব্যক্তি একটি নির্দিষ্ট দূরত্ব 20 miles an hour বেগে যায় এবং 30 miles an hour বেগে ফিরে আসে। তার গড় গতি কত? সমাধান: *ধরি, যাওয়া-আসার দূরত্ব x miles। *যাওয়ার সময় = x ÷ 20 ঘণ্টা -ফেরার সময় = x ÷ 30 ঘণ্টা *মোট সময় = (x ÷ 20) + (x ÷ 30) = (3x + 2x) ÷ 60 = 5x ÷ 60 ঘণ্টা *মোট দূরত্ব = 2x miles (যাওয়া-আসা) *গড় গতি = মোট দূরত্ব ÷ মোট সময় = 2x ÷ (5x ÷ 60) = (2x × 60) ÷ 5x = 24 miles per hour -সুতরাং, ব্যক্তিটির গড় গতি 24 miles per hour। সঠিক উত্তর: (D) 24Related questions
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