An empty tank can be filled by pipe A in 4 hours and by pipe B in 6 hours. If the two pipes are opened for 1 hour each alternately with first opening pipe A, then the tank will be filled in

An empty tank can be filled by pipe A in 4 hours and by pipe B in 6 hours. If the two pipes are opened for 1 hour each alternately with first opening pipe A, then the tank will be filled in
1). $1\frac{3}{4}$ hours
2). $2\frac{3}{5}$ hours
3). $4\frac{2}{3}$ hours
4). $5\frac{1}{2}$ hours

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