Subject
Bank Exam
Topic
জনতা ব্যাংক লিমিটেড আরসি (রুরাল ক্রেডিট) - ২৭.১০.২০২৩
A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still (without stream) water?
A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still (without stream) water?
ক)
10 km/hrখ)
12 km/hrগ)
14 km/hrঘ)
8 km/hrExplanation
Let, the speed (in km/hr) of the boat in still (without stream) water is x km/hr and speed of stream is y km/hr Now, 143/(x - y) = 13 ⇒ 13 (x - y) = 143 ⇒ x - y = 11..........(i) 143/(x + y) = 11 ⇒ 11 (x + y) = 143 ⇒ x + y = 13..........(ii) (i) + (ii) ⇒ x - y + x + y = 13 + 11 ⇒ 2x = 24 ∴ x = 12 km/hrRelated questions
বাংলা ব্যাকরণ গ্রন্থ প্রথম কোন বাঙালি রচনা করেন?If 4x + y= 1 and 4x - y= 4, then the values of x and y respectively are-আচার ও বোতাম শব্দ দুটি কোন ভাষা হতে বাংলায় গৃহীত হয়েছে?√(4/3) - √(3/4) = ?দুটি বাক্যকে এক বাক্যে পরিণত করার কাজ করে কোনটি?The ages of Sabiha and Suriya are in the ratio of 7 : 3 respectively. After 6 years, the ratio of their ages will be 5 : 3. What is the difference in their ages?'মনীষা' এর সন্ধি বিচ্ছেদ -A scored 30% marks and failed by 15 marks. B scored 40% marks and obtained 35 marks more than those required to pass. The pass percentage is-