Question
A boat can travel 20 km more in downstream than that in
upstream, in 10 hours while the difference between the time taken by the same boat to travel 210 km and 126 km, in still water, is 4 hours. Find the approximate time taken by the boat to travel 220 km in downstream and 183 km in upstream.Solution
Let the speed of boat in still water and speed of stream be 'x' km/hr and 'y' km/hr, respectively. According to question; (210/x) - (126/x) = 4 Or, (84/x) = 4 So, x = 21 Now, 10 x (21 + y) = 10 x (21 - y) + 20 Or, 210 + 10y = 210 - 10y + 20 Or, 20y = 20 So, y = 1 So, downstream speed of the boat = (21 + 1) = 22 km/hr And, upstream speed of the boat = (21 - 1) = 20 km/hr Required time taken = (220/22) + (183/20) ~ (10 + 9) ~ 19 hours
Match List-I with List-II:
What is the term used in insurance in which the ratio of premium underwritten in a particular year to the GDP. Â
The National Bureau of Plant Genetic Resources is located at
How does air pollution affect living organisms?
1. Sulphur dioxide irritates the respiratory tissues.
2. Nitrogen oxides, especially ...
Match the following:
Important revolts                 -                        Leaders
1. ...
‘Swachh Bharat Mission’ is associated with which public figure?
Which of the followings is NOT one of the government accounts of India?Â
In which Upanishad are the seven musical notes, sa, re, ga, ma, pa, dha and ni mentioned?
. What is the main objective of the Udyam Sakhi Portal of the Central Government?
The CGWB under the Ministry of Jal Shakti conducts regular monitoring and assessment of groundwater quality including ground water contamination of Ars...
