Start learning 50% faster. Sign in now
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
The capital of the Vajji Mahajanapada was ____________.
Which former executive of Care Ratings has been barred by SEBI from associating with any stock market intermediary for two years?
In what year did the EU and India launch their initiative for startups in Battery Recycling Technologies for Electric Vehicles (EVs)?
Which indigenously developed explosive was successfully tested by the Indian Navy, marking a significant achievement in India's defense self-reliance?
Shikhtila, Rapti and Chhoti Gandak are the tributaries of which of the following rivers?
What is the reproductive strategy called where parasites exploit the care of other individuals to raise their young?
Which statement is correct regarding the propagation of sound and light in different mediums?
I. Sound travels faster in water than in air.
<...The GST Council meeting discussed tax relief on:
In which districts of Uttar Pradesh, flowers are used to produce scents and perfumes?
Which bank has been assigned the Lead Bank Responsibility for the newly formed district of Maihar in the state of Madhya Pradesh?