SarkariPYQ

SSC CHSL 2023 PYQ — Question 72

SSC CHSL - 04 Aug 2023 - Shift 1 • Quantitative Aptitude • Q72

Back to paper

Aditya can complete the work of painting a grill in 20 hours while Vinay can complete the same work in 15 hours. If Aditya and Vinay both work together, then in how many hours will the grill painting work be completed?

Show answer & explanation

Correct answer: D

Explanation

The correct answer is Option 4 i.e 8478\frac{4}{7}.

Time taken by Aditya = 20 hrs

Time taken by Vinay = 15 hrs

L.C.M(20 and 15) = 60

Efficiency of Aditya = 60/20 = 3 units

Efficiency of Vinay = 60/15 = 4 units

Time taken by both = 60/(3 + 4) = 60/7 = 8478\frac{4}{7}