Question
Speed of a boat in still water is 4 times more than the
speed of stream. If boat covers 108 km in downstream in 9 hours, then find the time taken by the boat to cover 80 km in upstream.Solution
Let the speed of stream be ‘x’ km/hr. So, speed of boat in still water = 5 × x = 5x km/hr Downstream speed of boat = 5x + x = 6x km/hr According to question; 6x = 108/9 = 12 Or, x = 2 Upstream speed of the boat = 5x – x = 4x = 4 × 2 = 8 km/hr Required time taken = 80/8 = 10 hours
Which of the following books is not written by Chetan Bhagat?
Who authored the book "The Test of My Life"?
The book "Humayun Nama" is authored by Â
When was Project Tiger started in India?
Erza cup is associated with which sport?
Who wrote the famous book 'A Brief History of Time'?
Who became the 79th Chess Grandmaster recently?
Who is the author of the book "Why Bharat Matters," which is praised as a masterful exposition of diplomatic skills and political perspicacity?
Who is the author of the book "The Population Myth: Islam, Family Planning and Politics in India," which provides a detailed analysis of the 'Muslim rat...
In May 2019, The Indian Navy's first full-fledged Services Selection Board (SSB) is launched in which city ?
Relevant for Exams:
