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Rahim can build a wall in 4 days if he works 6 hours daily. Salman is twice efficient than Rahim. Then in how many days Rahim and Salman together will build the same wall if they are working 2 hours per day?

Rahim can build a wall in 4 days if he works 6 hours daily. Salman is twice efficient than Rahim. Then in how many days Rahim and Salman together will build the same wall if they are working 2 hours per day? Correct Answer 4  days

Given:

Rahim can build a wall in 4 days while working 6 hours daily.

Formula used:

M1H1D1 = M2H2D2

Here M1 = Efficiency of man in first case

M2 =  Efficiency of man in second case

H1 = Time taken to complete the work in first case

H2 = Time taken to complete the work in second case

D1 = Required days to complete work in first case

D2 = Required days to complete work in second case

Calculation:

Let efficiency of Rahim be 1 unit/day

Then the efficiency of Salman is 2 × 1 unit/day

⇒ 2 unit/day

So, According to the formula,

1 × 6 × 4 = (2 + 1) × 2 × D2

⇒ D2 = 24/6 days

⇒ D2 = 4 days

∴ Rahim and Salman can complete the work in 4 days if they work 2 hours per day.

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