Tap R can empty a fully filled tank in 30 hours. But two taps P and Q can fill the tank in 15 hours and 10 hours respectively. Ram unwittingly opened all three taps. After 2 hours, it was noticed by Shyam, and the tap R was closed. How much more time will it take to fill the tank due to this mistake?
1
18 minutes
2
2 hour 15 minutes
3
24 minutes
4
1 hour 20 minutes