Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and If pipe A is opened first, in how many hours,the tank shall be full

Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and If pipe A is opened first, in how many hours,the tank shall be full
1). $4\frac{1}{2}$
2). $3\frac{1}{2}$
3). $3\frac{1}{4}$
4). $4\frac{2}{3}$

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