A runs 5/2 time as fast as B, and gives B and a start of 40m. How long should the racecourse be so that A and B might reach in the same time?
Pick:
A) 150 m  B) 100 m  C) 75 m  D) 80 m  E) 90 m
verification of options..... (2/5)*100 =40   So answer is 100m   ANSWER:100 m
<result>B</result>
A runs 5/2 time as fast as B, and gives B and a start of 40m. How long should the racecourse be so that A and B might reach in the same time?