Light glows for every 13 seconds . How many max. times did it glow between 1:57:58 and 3:20:47 am.	Pick one
A) 380 times	B) 381 times	C) 382 times	D) 392 times	E) 482 times

Rationale: "time difference is 1 hr , 22 min , 49 sec = 4969 sec . so , light glows floor ( 4969 / 13 ) = 382 times . answer : c"
Answer: C