Subject
Quantitative Aptitude
Topic
Speed & Distance
A train covers a distance of 80 km at a speed of 40km/hr for the first 60 km and the remaining distance at a speed of 20 km/hr. What is the average speed of the train on the journey?
A train covers a distance of 80 km at a speed of 40km/hr for the first 60 km and the remaining distance at a speed of 20 km/hr. What is the average speed of the train on the journey?
ক)
24খ)
25গ)
30ঘ)
32ঙ)
none of theseExplanation
QUESTION : একটি train 80 km দূরত্ব অতিক্রম করে, প্রথম 60 km 40 km/hr গতিতে এবং বাকি দূরত্ব 20 km/hr গতিতে। যাত্রায় train-এর গড় গতি কত? সমাধান: *যাত্রার প্রতিটি অংশের জন্য সময় নির্ণয়: -প্রথম 60 km, 40 km/hr গতিতে: 60 / 40 = 1.5 ঘণ্টা -বাকি 20 km, 20 km/hr গতিতে: 20 / 20 = 1 ঘণ্টা *মোট সময় নির্ণয়: -মোট সময় = 1.5 + 1 = 2.5 ঘণ্টা *গড় গতি নির্ণয়: -গড় গতি = মোট দূরত্ব / মোট সময় - 80 km / 2.5 ঘণ্টা - 32 km/hr অতএব, train-এর গড় গতি 32 km/hr। সঠিক উত্তর হল (D) 32 km/hrRelated questions
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