The sum of the speeds of two boats A and B in still water is 56 km/hr. such that the speed of boat A in still water is 25% less than that of boat B in still water. If the upstream speed of boat A is 88% less than the downstream speed of boat B, then find the speed of the current.
Let the speed of boat B in still water be x km/hr. Therefore, the speed of boat A in still water =0.75x km/hr. According to the question, 0.75x + x = 70 Or, 1.75x = 70 Or x = 40 Therefore, the speed of boat B in still water = x =40 km/hr. Speed of boat A in still water = 0.75x = .75×40=30km/hr. Let the speed of the current be ‘y’ km/hr. Downstream speed of boat B = (40 + y) km/hr. Upstream speed of boat A = (30 – y) km/hr. 0.12(40 + y) = 30 – y Or, 4.8 + 0.12y = 30 – y Or, 0.12y + y = 30 – 4.8 1.12y =25.2 y=25.2/1.12=22.5 therefore, speed of the current =22.5km/hr.
In which year was India’s National Human Rights Commission set up?
__________ has the lowest record of population density having just 17 per square kilometre, as per census 2011.
The study of languages is called.
Match the List I with List II and choose your answer from codes given below:
List I (Person) ...
Which of the following is the largest Ramsar site in India?
Which is not viral disease_______?
The guest smiled to me when I entered the room as if he knew me.
The Udaygiri caves are located at ______ in Odisha state.
Which zone separates the crust and mantle?
Which of the following pairs of State and formation year is/are correct?
I. Nagaland - 1972
II. Uttarakhand - 2000
III. Arunachal Pradesh - 1987
