Idk really but i hope you figure out the answer im not on that yet.
Answer: 2820 seconds
1 minute = 60 seconds
Multiply the value times 60
47×60=2820
O.N. of Na = +1
O.N. of O = -2
Let, O.N. of Tin = x
1*2 + x + -2*2 = 0
2+x-4 = 0
x-2 = 0
x = 2
SO OPTION C IS YOUR ANSWER......
