A brand-new battery with a capacity of 840 mAh has a constant output voltage of 1.5 V The internal resistance of the battery is neglected. When it drives Load A, the output current of the battery is described as shown in Fig. HW2. After the battery drives Load A for 256 minutes. Load A is removed and the battery is used to drive Load B for 72 minutes before its capacity is used up. If Load B is a resistor with constant resistance, what will be its resistance?

Current(mA) One Cycle 150 50 3 6 9 12 Time(ms) Fig. HW2