1st and 2nd question galat btaya aapne sir... Because ve log saath milkr bhi to kaam krte hn.. so tick aap shi kr rhe ho.. lekin wo hamare according m galat bta rhe ho
Galat answer bataya Dekho A aur B sath me kaam karte hai 3 din to total kaam hota hai 15 30- 15 = 15 kaam bachta hai B chodkar chala jata hai A ka kaam karta hai 1 din Me 3 kaam to 15/3 = 5 to bacha kaam A 5 din me complete karta hai