Light glows for every 15 seconds . How many times did it between 1:57:58 and 3:20:47 am
Choices.
A) 381 B) 332 C) 383 D) 334 E) 385

Rationale: "the diff in sec between 1 : 57 : 58 and 3 : 20 : 47 is 4969 sec , 4969 / 13 = 331 . so total 332 times light ll glow answer : b"
Answer: B