in a 300 m race a beats b by 22.5 m or 6 seconds . b ' s time over the course is :
"runs 45 / 2 m in 6 sec . b covers 300 m in 6 x 2 / 45 x 300 sec = 80 sec . answer : b"
subtract(300, divide(300, multiply(divide(300, subtract(300, 22.5)), divide(300, subtract(300, 6)))))