Question
The speed of boat downstream and upstream is 30 km/hr
and 20 km/hr respectively. Time taken to travel a distance of (a + 50) km downstream and (b + 25) km upstream is 12 hours, and time taken to travel (a + 90) km upstream and (b + 70) km downstream is 18 hours. Find the difference between the value of a and value of b.Solution
According to question, (a+50)/30+(b+25)/20=12 (2a+100+3b+75)/60=12 2a+3b=720–175=545 … (iii) Also, (a+90)/20+(b+70)/30=18 (3a+270+2b+140)/60=18 3a+2b=1080–410=670 … (iv) Solving equation (iii) and (iv), we get, a=125 and b=95 Therefore, required difference = 125 – 95 = 30
Device that converts digital signals to analog signals at the start of long-distance transmissions is
Which of these devices helps a computer understand human commands?
What is the function of the puck?
What does URL stand for in web browsing?
What is the mounting of file system?
Antivirus software is classified as:
Hard disk can be formatted at the time of
The data remains the same after saving the file and turning off the computer-
Who invented email?
Communication controls for the entire computer system?
Relevant for Exams:
