Question

A cistern can be filled by tap A in 4 hours and emptied by tap B in 6 hours. How long will it take to fill the cistern if both the taps are opened simultaneously?
Work done by tap A in 1 hour 

Work done by tap B in 1 hour 

Time taken to fill the cistern  ​

Answer 1

Answer:

12 hours taken to fill cistern

answerrr

Lcm of 4,6 = 2×2×3