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Ravi can alone build the wall in **5 days**.

Sanjay can alone build the wall in **8 days**.

Mukund can alone build the wall in **10 days**.

Due to climatic changes the individual time required for each to complete the work has increased to **20%, 25% & 50%** respectively.

**To find:** time required to build the wall if Ravi, Sanjay & Mukund work together.

Since the individual time required to build the wall has increased due difficult terrain and slushy conditions at site.

The new time taken by three of them individually will be

Ravi can alone build the wall in =** (120/100) * 5 = 6 days. **

Sanjay can alone build the wall in =** (125/100) * 8 = 10 days. **

Mukund can alone build the wall in =** (150/100) * 10 = 15 days. **

So, **in 1 day**

Ravi can do =** (1/6)th of work **

Sanjay can do =** (1/10)th of work **

Mukund can do =** (1/15)th of work **

∴**Total work done in 1 day if three of them work together = 1/6 + 1/10 + 1/15 = 10/30 = 1/3 **

By **unitary method**, we can get

If **1/3rd** of whole work is done in **1 day**.

Then,

The whole work will be done in = **1/(1/3) = 3 days**.

∴**Total time required by Ravi, Sanjay & Mukund to build the wall, if they work together = 3 days. **

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