Question
A motor boat covers a certain distance downstream in a
river in 4 hours. It covers the same distance upstream in 4 hours and 30 minutes. If the speed of water is 2 km/h, then the speed of the boat in still water is:Solution
Let the speed of boat in still water be x km/hr and the distance be y km. Rate downstream = (x + 2) km/hr Rate upstream = (x – 2) km/hr According to the question, y/(x + 2) = 4 --- (i) y/(x – 2) = 9/2 --- (ii) On dividing equation (i) by (ii), (x – 2)/(x + 2) = 4/(9/2) = 8/9 9x – 18 = 8x + 16 x = 18 + 16 = 34 kmph
 For the 2018 year who was the winner of the Nobel Peace Prize?
The Davis Cup 2021 was won by _________.
Who became the first Indian male squash player to enter the top 10 in the PSA world rankings?
Which Indian state does not require an Inner Line Permit System?
With which of the following government banks has the Bharatiya Mahila Bank has merged in 2017?
Which State in India is the highest producer of raw silk?
In the 75th year of Independence, in August 2022, 11 New Ramsar Sites in India were added to the list.. Which state in India has the highest number of ...
What does SPM in environment mean?
Where is the Ranthambore National Park located?
Which article of the Indian Constitution guarantees the right to equality before the law?
Relevant for Exams:
