Subject
Quantitative Aptitude
Topic
Boat and Stream
A boatman takes twice as long to row a distance against the stream as to row the same distance with the stream. Find the ratio of speeds of the boat in still water and the stream.
A boatman takes twice as long to row a distance against the stream as to row the same distance with the stream. Find the ratio of speeds of the boat in still water and the stream.
ক)
2 : 1খ)
3 : 1গ)
1 : 2ঘ)
1 : 3Explanation
Let, speed of boat in still water = u " " " stream = v Given Condition, Time taken against the stream = 2 × time taken with the stream => x/u-v = 2 × x/u+v [ same distance=x ,, Time =distance/speed ] => 1/u-v = 2/u+v => 2u - 2v = u + v => 2u-u = 2v + v => u =3v => u/v = 3 ∴ u : v = 3 : 1Related questions
স্থির পানিতে একটি নৌকার গতিবেগ ৮ কিলোমিটার এবং স্রোতের প্রতিকূলে ওই নৌকার গতিবেগ ৫ কিলোমিটার হলে স্রোতের গতি ও স্রোতের অনুকূলে ওই নৌকার গতিবেগ কতA boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is: (যদি একটি নৌকা স্রোতের প্রতিকূলে 42 মিনিটে 7 কি. মি. যায় এবং স্রোতের গতি 3 কি. মি./ঘন্টা হয়, তাহলে স্থির পানিতে নৌকার বেগ কত?)The ages of Samina and Suhana 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 ? (সামিনা ও সুহানার বয়সের অনুপাত 7:3 । 6 বছর পরে তাদের বয়সের অনুপাত হবে 5:3 । তাদের বয়সের পার্থক্য কত ?)