Subject
Quantitative Aptitude
Topic
Speed & Distance
A train travels a distance of 600 km at a constant speed.If the speed of the train is increased by 5 km/hr,the journey would take 4 hours less.Find the speed of the train.
A train travels a distance of 600 km at a constant speed.If the speed of the train is increased by 5 km/hr,the journey would take 4 hours less.Find the speed of the train.
ক)
25 km/hrখ)
50 km/hrগ)
100 km/hrঘ)
none of theseExplanation
(একটি ট্রেন নির্দিষ্ট ধ্রুব গতিতে চলে ৬০০ কিলোমিটার দূরত্ব অতিক্রম করে।যদি ট্রেনটির গতিবেগ ঘন্টায় আরও ৫ কিলোমিটার বেশি হতো ,যাত্রার সময় ৪ ঘন্টা কম লাগতো।ট্রেনের গতি কত? ধরি,ট্রেনটির গতি x km/hr ট্রেনটির গতিবেগ ৫ km/hr বেশি হলে সময় ৪ ঘন্টা কম লাগতো। প্রশ্নমতে,(600/x) - (600/x+5) =4 or, (600x +3000 - 600x)/x(x+5) =4 or, 3000=4x(x+5) or, x(x+5)=750 or, x 2 +5x-750=0 or, (x+30)(x-25)=0 ∴ x=25 km/hrRelated questions
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