Question

If tap A can fill a tank in 12 hours, tap B in 20 hours and tap C can empty the tank in 30 hours, how long after all of them are opened together will the tank full? Grade 8 ICSE direct and inverse variation​

Answer 1

Answer:

In 1hr

Tap A can fill 1/12

Tap B can fill 1/20

Tap C can empty 1/30

While All three are working for 1 hr

1/12 + 1/20 - 1/30 = 6/60 = 1/10 tank will be filled

that means in 10hr tank would be full.