Subject
Quantitative Aptitude
Topic
Speed & Distance
the speed of a car increases by 2 kms after every one hour. If the distance travelled i the first one hour was 35 kms, what was the total distance travelled in 12 hours?(একটি কারের গতি প্রতি ঘন্টায় 2 km করে বৃদ্ধি পায়, যদি প্রথম ঘন্টায় এটি 35 km দূরত্ব অতিক্রম করে তাহলে 12 ঘন্টায় এটি মোট কত দূরত্ব অতিক্রম করে?)
the speed of a car increases by 2 kms after every one hour. If the distance travelled i the first one hour was 35 kms, what was the total distance travelled in 12 hours?(একটি কারের গতি প্রতি ঘন্টায় 2 km করে বৃদ্ধি পায়, যদি প্রথম ঘন্টায় এটি 35 km দূরত্ব অতিক্রম করে তাহলে 12 ঘন্টায় এটি মোট কত দূরত্ব অতিক্রম করে?)
ক)
456 kmsখ)
482 kmsগ)
552 kmsঘ)
556 kmsExplanation
১ম ঘন্টায় যায় = 35 km ২য় ঘন্টায় যায় = (35+2) = 37 km ৩য় ঘন্টায় যায় = (37+2) = 39 km ∴ 35+37+39+............+ 12তম সংখ্যা, n = 12 প্রথম পদ, a = 35; সাধারণ অন্তর, d= 2; পদ সংখ্যা, n =12 ∴ সমষ্টি, S n = (n/2){2a+(n-1)d} = (12/2){2×35(12-1)×2} = 6×{70+(11×2)} = 552 kmRelated questions
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