Light glows for every 16 seconds . How many times did it between 1:57:58 and 3:20:47 am  Choose the correct choice from the following answers:
A) 311
B) 322
C) 313
D) 314
E) 385

Rationale: "the diff in sec between 1 : 57 : 58 and 3 : 20 : 47 is 4969 sec , 4969 / 16 = 310 . so total 311 times light ll glow answer : a"
Answer: A