Question

please solve these problems ​

Answer 1

Answer:

Step-by-step explanation:

Pipe A fill cistern in 6 hours

Pipe B empty cistern ? hours

both pipe open then cistern filled in 7 hours

lcm of 6 and 7 is 42

one hr work of A is 7 and one hr work of B is 6 hrs

hence pipe B’s one hr work =1

hence pipe B can empty cistern is 42/1=42 hours