Question:
It takes 4 minutes for Tap A to fully fill an empty tank on its own. It takes 5 minutes for Tap B to fully fill the same empty tank on its own. Starting with an empty tank, how long does it take for both taps to fill the entire tank given that both taps are turned on at same time? Give your answer in minutes.
Solution:
![P6 / Nanyang / 2019 / SA2 / Paper 2 – Q09 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/07/P6_Nanyang_2019_Prelims_Paper2_Q09-Qns.jpg?resize=400%2C260&ssl=1)