Bob wants to run a mile in the same time as his sister. If Bob’s time for a mile is currently 10 minutes 40 seconds and his sister’s time is currently 9 minutes 17 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?
Choices
A) 3% B) 5% C) 8% D) 10% E) 13%
Bob's time = 640 secs.   His sis' time = 557 secs.   Percent increase needed = (640-557/640) * 100 = 83/640 * 100 = 13%. Ans (13%).
<result>E</result>
Bob wants to run a mile in the same time as his sister. If Bob’s time for a mile is currently 10 minutes 40 seconds and his sister’s time is currently 9 minutes 17 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?