Question
A boat covers 45 km downstream in 90 minutes. If the
ratio of the speed of the boat in still water to that of the speed of the stream is 5:3, respectively, then find the time taken by the boat to cover a distance of 15 km upstream.Solution
ATQ, Speed of the boat downstream = (45/90)×60 = 30 km/h Let the speed of the boat in still water = 5x km/h Speed of stream = 3x km/h Speed of the boat downstream = 5x+3x = 8x km/h 30 = 8x x = 30/8 = 3.75 Speed of the boat in still water = 5×3.75 = 18.75 km/h Speed of the stream = 3×3.75 = 11.25 km/h Speed of the boat upstream = 18.75−11.25 = 7.5 km/h Time taken by the boat to cover the distance of 15 km upstream = (15/7.5) × 60 = 120 minutes
What was the slogan for National Girl Child Day 2019?
PT Usha, who received the prestigious Arjuna Award in 1984 for showing outstanding performance in sport, belongs to which state?
Which of the following types of crops are sown after the end of the monsoon season?
For women entrepreneurs what is the subsidy provided under the Prime Minister Employment Generation Programme (PMEGP)?
Which of the following is an autobiography of a Bengali illiterate woman who secretly acquired literacy skills to read sacred texts in an age when girls...
- Which of the following is tiger reserve is in UP?
In SMA -1, the overdue period is from ______________.
Who holds the portfolio of Ministry of Home Affairs (as of July 2023)?
Match List – I with List – II and select the correct answer using the codes given below the lists:
Rajyavardhan Singh Rathore won a silver medal in 2004 Olympics for ___________.
Relevant for Exams:
