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Let, the speed of boat be b km/hour and speed of current be s km/hour Average speed = 2xy/(x+y) (here, x is speed of downstream and y is speed of upstream) = (2 (b+s)(b-s))/((b+s+b-s)) = (b2 - s2)/b = (225 - 25)/15 = 200/15 = (40/3) km/hour Alternate Method :- Average speed = (Total distance covered)/(total time taken) = (2×60)/9 = 120 /9 = 40/3 kmph
Which operating systems are designed to operate on small machines with limited resources, such as PDAs?
What is commonly used for displaying information at public places?
A new workbook contains how many worksheets by default in MS Excel?
___________ is a programming language for creating special programs like applets.
Microprocessor was introduced in which generation of computer?
_______ operation relates to a set of computers connected to a LAN.
At which of the following institutions ERNET is used to connect computers?
Which company makes the Windows operating systems?
In an operating system, which memory management technique swaps out entire processes to free up memory space?
At which layer of the OSI model does IP (Internet Protocol) work?