Question
In still water, the speed ratio of boats A and B is
10:7. Boat A’s still-water speed is twice the stream speed. If A covers 180 km downstream in 6 hours, how long will B take to go 72 km upstream?Solution
ATQ, Let the speeds be 10x and 7x km/hr Stream speed = 10x/2 = 5x Downstream speed of A = 10x + 5x = 15x 180/6 = 30 ⇒ 15x = 30 ⇒ x = 2 Required time = 72/(7x – 5x) = 72/(2x) = 72/4 = 18 hours
Which command is used to make a shell script executable?
In bash, what does trap 'echo Exit' EXIT do?
In shell scripting, which symbol is used to redirect the standard output to a file, overwriting its contents?
Which command is used to display the first few lines of a file?
Which command is used to display the contents of a file in Linux?
In shell scripting, $1 represents:
Which ETL process step validates and cleans data before loading?
In shell scripting, which symbol represents all files in the current directory?
Star schema consists of:
Which operator is used to append output to a file?
