tolong jawab pake cara ya pleass makasih no 3, 4,5

ini yaa.... maaf kaloo salahh

3.) q = 4500C
t = 15 menit = 15x60 = 900s
Dit : I = ?
I = Q/t
= 4500/900
= 5A
4.) I = 500mA = 0,5A
t = 5menit = 5x60 = 300s
Dit : q = ?
Q = I.t
= 0,5.300
= 150C
5.) I = 250mA = 0,25A
Q = 5000C
Dit " t =?
t = Q/I
= 5000/0,25
= 20000s