Question : Dev completed the school project alone in 40 days. How many days will Arun alone take to complete the same work if he is 25% more efficient than Dev?

Option 1: 35 days

Option 2: 14 days

Option 3: 32 days

Option 4: 16 days

Question : A can do a piece of work alone in 40 days. A and B together can do the same work in 10 days. C is 50% less efficient than B. In how many days can A and C together complete the same work?

Option 1: 20 days

Option 2: 24 days

Option 3: 16 days

Option 4: 12 days

Question : S alone can do a piece of work in 14 days. T alone can do the same work in 21 days. U alone can do the same work in 28 days. Working together, in how many days will they complete the work?

Option 1: $\frac{84}{13}$ days

Option 2: $\frac{77}{13}$ days

Option 3: $\frac{71}{13}$ days

Option 4: $\frac{87}{13}$ days

Question : Vihaan is twice as efficient as Mayur and can finish a piece of work in 14 days less than Mayur. In how many days Mayur can finish this work?

Option 1: 14 days

Option 2: 21 days

Option 3: 28 days

Option 4: 7 days

Question : A and B together can do a piece of work in 24 days. A alone can do this work in 40 days. In how many days can B alone do this work?

Option 1: 40 days

Option 2: 56 days

Option 3: 60 days

Option 4: 16 days