A resistor and an inductor are connected in series to a battery with emf 240 V and negligible internal resistance. The circuit is completed at time t=0. At a later time t=T the current is 4.00 A and is increasing at a rate of 20.0 A/s. After a long time, the current in the circuit is 25.0 A. What is the value of T, the time when the current is 4.00 A?