Question

A and B working together can complete a job in 3hours, if A alone can do the job in 15/2 hours, in how much time can B alone finish the job?​

Answer 1

Answer:

9/2 Hours

A + B = 3 Hours

A = 15/2

Then, B = 15/2 - 3/1

= 15-6/2

= 9/2 Hours

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Answer 2

Answer:

B complete the work in 5 hrs

Step-by-step explanation:

A and B can complete the job in 3 hrs

A alone can do in 15

Let B can do in x hrs

Then,

1/x + 2/15 = 1/3

1/x = 1/3 -2/15

1/x =3/15

x=5

Hence,B alone can complete the job in 5 hrs

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