Question
A boat goes downstream at 28 km/hr and upstream at 20
km/hr. If it takes 14 hours to travel (x + y) km upstream when the stream speed is doubled, then what is the average of x and y?Solution
ATQ,
Let, speed of boat in still water and stream speed be B km/hour and s km/hour, respectively.
So, (B + s) = 28 … (i)
Also, (B – s) = 20 … (ii)
Solving equation (i), and (ii), we get,
B = 24 km/hour
s = 4 km/hour
According to question,
(x + y)/(B – 2s) = 14
(x + y) = 14 × (24 – 2 × 4) = 14 × 16 = 224 km
Therefore, average value of x and y = (x + y)/2 = 224/2 = 112 km
Consider the following statements about Mohenjo Daro:
1.   Archaeologists recently discovered 2000-year-old copper coins in this area.
Recently Who has become the first ever woman director general of the Council of Scientific and Industrial Research ( CSIR) ?
By how much did loans to Micro, Small, and Medium Enterprises (MSMEs) grow in the current fiscal year according to RBI data?
The International Cricket Council (ICC) has imposed a five-year period of ineligibility on which West Indies player for breaching multiple anti-corrupti...
The 'One Nation, One Election' plan requires constitutional amendments, particularly to which of the following Articles?
The Indian Navy, in continuation with celebrating its ‘Azadi ka Amrit Mahotsav’ has partnered with ______ to embark on a motorcycle expedition in La...
Which Hungarian author won the Nobel Prize in Literature in 2025?
The 28th Asian Table Tennis Team Championship 2025 will be hosted in which Indian city?
The 3rd edition of the Singapore, India and ________ Trilateral Maritime Exercise (SITMEX – 21) commenced in the Andaman Sea.
What is the IMF’s GDP growth projection for India in 2025-26, as per its World Economic Outlook?
Relevant for Exams:
