Question
Manoj can complete a job in 10 days which Rakesh can do
in 15 days. Rakesh can finish a task in 20 days which Suresh can complete in 25 days. In how many days Suresh and Rakesh together can finish the work that Manoj can do in 90 days?Solution
Let the efficiency of Manoj, Rakesh, and Suresh be p, q, and r units/day respectively. So, 10p = 15q p = 15q / 10 p = 3q / 2 Again, 20q = 25r r = 20q / 25 r = 4q / 5 Now, ratio of efficiencies of Manoj, Rakesh, and Suresh = (3q/2) : q : (4q/5) Multiply each term by 10 to remove fractions = (15q) : (10q) : (8q) ⇒ 15 : 10 : 8 Let p = 15e, q = 10e, and r = 8e Let required time = T days So, (10e + 8e) × T = 15e × 90 ⇒ 18T = 1350 ⇒ T = 75 days
Palladium on barium sulphate (Pd/BaSO₄) is also known as:
“Magnus Carlsen” is associated with which of the following games?
In 1932, who founded the 'All India Harijan Sangh', also known as 'Harijan Sevak Sangh'?
On whose advice did Gandhiji spend a year travelling around British India to know the people of India?
Consider the following statement about 2023 Gender Social Norms Index:
1. This Index is developed by the UNDP
2. This index covered 60 per...
When was the first ‘Minning Policy’ in Uttarakhand State declared?
India accounts for 45.8 million of the world’s missing females according to the State of World Population 2020 report of:
What is the traditional culinary delight from Odisha’s Mayurbhanj district that recently received a Geographical Indication (GI) tag?
In November 2025, a High-Level Committee chaired by ______ submitted its report on “Conflict of Interest, Disclosures and related matters in respect o...
Whose reign saw the largest extension of Delhi Sultanate?
Relevant for Exams:
