Question

How long does it take a current of 5.0mA to deliver 15C of charge?

Answer 1

it takes time q/i
so t= 15/.005
= 3000 sec

Answer 2

current is basically the rate of charge flow.

So basically I=Q/TI=Q/T C/sec

So, putting your values:

I=0.005I=0.005 Amp.

Q= 15 C

Putting these values, 0.005=15/T0.005=15/T

That gives, T =15/0.005Sec15/0.005Sec

T= 3000 sec = 50 minutes