Two resistors, A and B, are connected in parallel across

Two resistors, A and B, are connected in parallel across a 6.0-V battery. The current through B is found to be 2.0 A. When the two resistors are connected in series to the 6.0-V battery, a voltmeter connected across resistor A measures a voltage of 4.0 V. Find the resistances of A and B.