A can run 4 times as fast as B and gives B a start of 60 m. How long should the race course be so that A and B might reach in the same time?
Options: A) 70 m B) 60 m C) 80 m D) 65 m E) 75 m

Rationale: "speed of a : speed of b = 4 : 1 means in a race of 4 m a gains 3 m . then in a race of 60 m he gains 60 * ( 4 / 3 ) i . e 80 m answer : c"
Answer: C