a light flashes every 12 seconds, how many times will it flash in ? of an hour?  Pick.
A) 550  B) 300  C) 650  D) 700  E) 750

Rationale: "1 flash = 12 sec for 1 min = 5 flashes so for 1 hour = 5 * 60 = 300 flashes . answer : b"
Answer: B