Question
The speed of a boat in still water is 30 km/hr. If the
boat covers 160 km in upstream in 8 hours, then find the time taken by the boat to travel 120 km in downstream.Solution
Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 160/8 = 20 km/hr Or, 30 – y = 20 Or, y = 30 – 20 = 10 km/hr Therefore, downstream speed of the boat = 30 + 10 = 40 km/hr Required time taken = 120/40 = 3 hours
Which protocol is used for real-time communication over the internet?
What is the purpose of the "isolation" property in transactions?
A communications protocol defines the rules for sending blocks of data (each known as a Protocol Data Unit (PDU)) from one node in a network to another ...
What is artificial intelligence (AI)?
Attributes that do not exist in the physical database, but their values are derived from other attributes present in the database.
In syntax-directed translation, what is a production rule associated with?
In RDBMS, what is the purpose of the Data Dictionary?
Which sorting algorithm is known for its best-case time complexity of O(n) when the input is already partially sorted?
Which of the following statements about MOSFETs is true?
Which scheduling algorithm is used to allocate CPU time to processes in an operating system?