Question
A Boat travel 80 km distance in downstream and 48 km
upstream and the total time taken is 20 hours. The same boat travels 30 km distance in downstream as much time travel 12 km in upstream. Find the speed of boat in still water?Solution
Let the speed of stream be x And speed of Boat be y Total time taken =80/(x+y) + 48/(x - y) = 20 ………………………. (i) And time taken for 30 km in downstream and 12 km in upstream is equal 30/(x + y) = 12/(x - y) 5x – 5y = 2x + 2y 3x = 7y x/y = 7/3 Now x = 7k and y = 3k Put the value of x and y in equation (i), 80/(7k + 3k) + 48/(7k - 3k) = 20 80/10k + 48/4k = 20 8/k + 12/k = 20 20/k = 20 k = 1 Therefore the speed of Boat in still water is 7 × 1 = 7 km/hr
Who has been named as the captain of the Indian T20 team for the tour of Ireland?
In the largest hockey stadium of the country was inaugurated in?
Who is the Minister of Social Justice and Empowerment?
In which of the following states, Micro Financing was first introduced by the SEWA Bank, a division of the Self-Employed Women's Association (SEWA), in ...
Which canal serves as a shortcut for maritime trade between Europe and Asia?
This year’s Nobel Prize in Physics has been awarded to three physicists for their research into?
Consider the following Pairs;
Which of the above give...
Which ministry recently launched Project PARI (Public Art of India), aimed at showcasing public art inspired by India's rich artistic heritage (lok kala...
According to recent information, what was the value of defense production in India during the Financial Year (FY) 2023-24? According to recent informati...
In which city was the National Basketball Academy established in collaboration with Corvuss American Academy by the Basketball Federation of India?
