AAI ATC Junior Executive 2018 Shift 2 Paper

Question : 38 of 120

Marks: +1, -0

Tap A can fill an empty tank in 10 h while tap B can empty a fully-filled up tank in 12 h. Tap A is turned on first. After 2 hours, Tap B is also turned on. What will the total time (in hours) taken to fill the tank be?