Question

A can build a wall in 30 days, which B alone can build a wall in 40 days. If they will work together then how much time they will take to build a wall?

Answer 1

Answer:

Let a be the working rate of A

Let b be the working rate of B

Since A is twice as good as B, this means that 2a = b — which means that you would need 2 B's to work at the same rate as A, or, two employees working at B's level is equal to 1 A.

A and B the working together to finish their work in 30 days.

Therefore,

30 = a + b

30 = a + 2a

30 = 3a

a = 10

This means, it took A 10 days to finish the project with B, and it took B

2a = b

=> 2(10) = b

=> b = 20

It took B 20 days to finish the work with A.

Now if A is doing the same amount of work alone, he needs to do B's 20 days of work.

Since 2a = b

=> 2a = 20

=> a = 10

Step-by-step explanation:

Pls Mark Brainliest