Question
A boat takes 7 hours to cover 273 km upstream and 9
hours to cover 441 km downstream. Find the time taken by the boat to cover 540 km upstream and 459 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.Solution
Upstream speed = 273/7 = 39 km/h Downstream speed = 441/9 = 49 km/h Speed of boat in still water = (39 + 49)/2 = 44 km/h  Speed of stream = (49 – 39)/2 = 5 km/h Increased speed of boat in still water = 44 + 4 = 48 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 540/(48 – 3) + 459/(48 + 3) = 12 + 9 = 21 hours
Which of the following is an example of an adjusting journal entry?
With reference to the 74th constitutional amendment act of 1992 which of the following events led to the development of urban local government in moder...
The RBI has signed a Currency Swap Agreement with the Maldives Monetary Authority (MMA); the SAARC Currency Swap Agreement came into operation in ______...
Which of the following option is incorrect about “Kisan Samman Nidhi Yojana”?
Bio-remediation is a technology which is being extensively utilized in controlling
The Indian Parliament is bicameral in nature. Which of the following is the upper house?
With reference to the Finance Commission of India, consider the following statements:
1. According to the constitution of India, the members o...
As of July 2022, PM-VIKAS is aligned to the 15th Finance Commission cycle period up to _________ and is a Central Sector (CS) scheme under the Ministry ...
 Which of the following will turn blue litmus red ?
Who is an 'Adolescent' as per the Factories Act, 1948 ?
Relevant for Exams:
