Time and work problem concepts – UGC NET Question

Statements A, B and C are correct because they follow the standard work-rate model: daily work is reciprocal of time, combined rate is additive and rate and time are inversely related when total work is fixed. Statement E is also true, as time and work problems are common in competitive exams including UGC NET. Statement D is false, since doubling the number of workers at the same rate would halve the time, not double it. Hence, the combination that includes A, B, C and E and excludes D is correct.

Option A:
Option A is incomplete because although it lists three true statements, it omits E and therefore fails to acknowledge the practical relevance of time and work problems in exam contexts. Without E, the question’s aptitude orientation is underplayed.

Option B:
Option B is correct as it gathers all four true statements about how work rate is modelled and assessed in exams, and it rightly rejects D, which reverses the effect of doubling the workforce. This option matches the conceptual structure used in NET work-rate questions.

Option C:
Option C is wrong because it includes D, the incorrect statement about time doubling, and excludes A, missing the basic definition of one-day work. The presence of D makes the overall set invalid.

Option D:
Option D is incorrect since it excludes B and thus does not stress that combined work is the sum of individual works, while still omitting the false D. Even though A, C and E are true, leaving B out makes the description incomplete.