In a 80 meters race A beats B by 56 m or 7 seconds. A's time over the course is: Choose the correct choice from the following:
A) 3 seconds
B) 12 seconds
C) 10 seconds
D) 18 seconds
E) 28 seconds

Rationale: "b runs 56 m in 7 sec . = > b runs 80 m in 7 / 56 * 80 = 10 seconds since a beats b by 7 seconds , a runs 80 m in ( 10 - 7 ) = 3 seconds hence , a ' s time over the course = 3 seconds answer : a"
Answer: A