Question

if A fills a water tank in 6 hours
and B empty it in 10 hours. how many hours will need to fill it completely?

A) 10 hours
B) 12 hours
C)15 hours
D) None of this​

Answer 1

Answer:

answer is 15 hrs

Step-by-step explanation:

A fills it in 6 hrs

in 1hr it fills=1/6 of tank

B empty it in 10 hrs

in 1hr it empty = 1/10 of tank

if they are turned on together then

1/6 - 1/10

4/60

1/15 in hr

15 hrs to fill it completely