Question
A man must travel 600 km in 12 hours. If he traveled the
first 40% of the journey at a constant speed of 80 km/h, at what speed must he travel the remaining distance so that he finishes the journey on time?Solution
ATQ, 40% of 600 = 240 km Time taken to travel 240 km = 240 ÷ 80 = 3 hours Remaining distance = 600 - 240 = 360 km Remaining time = 12 - 3 = 9 hours So, speed at which remaining distance is to be traveled = 360 ÷ 9 = 40 km/h
What is referential integrity?
Which deadlock prevention scheme allows older transactions to preempt younger ones?
In an E-R Diagram, entities are typically represented by:
In PL/SQL, a `CURSOR` is used to:
A system is in a safe state when:
Which database model represents data in a tree-like structure, where each child record has only one parent?
A "diamond" shape in an E-R Diagram typically represents a:
Distributed transactions typically use which protocol for atomicity?
Which normal form ensures no partial dependency of non-prime attributes on a candidate key?
Which of the following is a non-relational database?
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