Light glows for every 15 seconds . How many max. times did it glow between 1:57:58 and 3:20:47 am.  Choose the correct choice.
A) 380 times	B) 381 times	C) 382 times	D) 392 times	E) 331 times

Rationale: "time difference is 1 hr , 22 min , 49 sec = 4969 sec . so , light glows floor ( 4969 / 15 ) = 331 times . answer : e"
Answer: E