Question
A boat travels from point 'Y' to point 'Z' downstream
and then returns to point 'X', which is located midway between 'Z' and 'Y'. The entire trip takes 11 hours. The distance between points 'Y' and 'Z' is 150 km. If the boat's speed in still water is three times the speed of the stream, determine how long it will take the boat to travel 180 km upstream.Solution
Let stream speed = s Boat speed in still water = 3s Downstream speed = 4s, Upstream speed = 2s Time: 150/(4s) + 75/(2s) = 11 => 37.5/s + 37.5/s = 11 => 75/s = 11 => s = 75/11 Upstream speed = 2s = 150/11 Time for 180 km upstream = 180 / (150/11) = 66/5 = 13.2 hours
The mode of nutrition in which an organism de-rives its food from the body of another living organism without killing it is called as-
Who is known as an “Administrative Authority” under “Mines act 1952”?
What is the maximum duration of maternity leave provided under the Maternity Benefit Act, 2017?
Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?
(1) Dispersion
Seven boxes A, B, C, D, E, F and G are kept one over the other but not necessarily in the same order. D is kept third from the bottom. Only one box is k...
Gopal Krishna Gokhale’s ‘The Servants of Indian Society’ was set up with which of the following objectives?
1. Prepare masses for sel...
6 years ago from now, ratio of ages of ‘R’ and ‘L’ was 5:7, respectively. If ‘L’ is 6 years elder to ‘R’, then what will be the age of �...
(210/3)% of the raindrops could have been collected, when 3 cm of rain has fallen on a part of land of area 2 km2, in a tank having a 200 m �...
Which one of the following is not an objective under Pradhan Mantri Krishi Sinchayee Yojana (PMKSY) ?
The provision of workers' participation in the management of industries is provided under
Relevant for Exams:
