question_answer

Two pipes A and B can fill a tank in 15 hours and 20 hours respectively A third pipe C can empty the full tank in 25 hours. All the three pipes are opened in the beginning. After 10 hours, C is closed. Find in how much time will the tank be full.                                                                                                 

A) 12 hrs

B) 8 hrs

C) 10 hrs

D) 14 hrs

E) 16 hrs