Question
A boat can cover 72 km upstream and 180 km downstream in
12 hours. Speed of the stream is how much less than the speed of the boat in still water if the boat can cover 54 km upstream and 150 km downstream in 9 hours?Solution
ATQ, ATQ, Let the upstream speed and downstream speed of the boat be x km/h and y km/h, respectively. So according to question: 72/x + 180/y = 12 ………………. (i) Also, 54/x + 150/y = 9 ……….. (ii) Solving (i) and (ii), we get x = 15 and y = 30 So, the upstream speed and downstream speed of the boat are 15 km/h and 30 km/h, respectively. Speed of the boat in still water = (15 + 30)/2 = 22.5 km/h Speed of the stream = (30 – 15)/2 = 7.5 km/h So, the desired difference = 22.5 – 7.5 = 15 km/h
Who wrote the book ‘If God Was A Banker’?
Which of the following fundamental duties was added to the Indian Constitution by the 86th Constitutional Amendment Act, 2002?
Which of the following is a computer virus?
Who won the Golden Lotus (Swarna Kamal) award for Best Direction for a Hindi film at the 70th National Film Awards for the year 2022?
The 1st Sherpa Meeting of India's G20 Presidency, chaired by G20 Sherpa Shri Amitabh Kant, was commencing in the historic city of________.
 Consider the following statements in reference to the Phylogenetic classification system.
1.   It shows an evolutionary relationship ...
Which schedule was added to the constitution by the 73rd Constitutional Amendment?
Criminal Procedure Code (CrPC), it is the primary legislation regarding the procedural aspects of criminal law.When did the CrPC Act came into force ?...
In 1927, Lord Birkenhead, Secretary of State for India, appointed a Committee of three members to enquire into the relationship between the Indian Stat...
In 1680, _________, son of Shivaji, ascended the throne after winning the war of succession against his brother Rajaram.
Relevant for Exams:
