Task: Question Answering
Input (English): Question: Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ?

 Option A: 4 hrs

 Option B: 5 hrs

 Option C: 7 hrs

 Option D: 9 hrs

 Option E: 8 hrs
Output (English): Option B