Question
The speed of the boat in still water is 20% less than
the speed of the boat in downstream. The time taken by the boat to cover 780 km distance in upstream is (t+3) hours. If the speed of the stream is 20 km/h, then find out the value of ‘t’.Solution
ATQ, Let ‘B’ be the speed of the boat in still water and ‘S’ the speed of the stream, with S = 20 km/h. B = (100-20)% of (B+S) = 80% of (B+S) = 0.8(B+S). B = 0.8(B+20), which leads to B = 0.8B + 16, thus 0.2B = 16, giving us B = 80 km/h. With the boat covering 780 km upstream, where upstream speed = B - S = 80 - 20 = 60 km/h, we have 780/(t+3) = 60. Solving for t yields t+3 = 780/60 = 13, Hence, t = 10. Value of ‘t’ = 10.
Having opened its Twitter account in _______, the Reserve Bank of India had more than 1 million followers on its official Twitter handle by November 2020.
Which of the following is the most gender equal country, according to Global Gender Gap Report 2021?
In which of the following states is the Tuluni Festival celebrated?
Deficiency of which of the following vitamins in the human diet causes a disease called xerophthalmia?
What is the study of the interactions between living organisms and their environment called?
Correctly match the following.
Which of the following becomes the first district in India to cover 100% households under ABPMJAY- SEHAT scheme?
What is the minimum duration of the contract signed by REC for its green bonds, valued at 61.1 million yen?
India's first mapping satellite:
Which statement is incorrectly related to Recurring Deposit?