Problem: in a 160 meters race a beats b by 56 m or 7 seconds . a ' s time over the course is :
Rationale: b runs 56 m in 7 sec . = > b runs 160 m in 7 / 56 * 160 = 20 seconds since a beats b by 7 seconds , a runs 160 m in ( 20 - 7 ) = 13 seconds hence , a ' s time over the course = 13 seconds answer : c
annotated_formula: subtract(multiply(divide(7, 56), 160), 7)