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 10 minutes 8 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) 12%
Bob's time = 640 secs.   His sis' time = 608 secs.   Percent increase needed = (640-608/640) * 100 = 32/640 * 100= 
<gadget id="calculator">32/640 * 100</gadget>
<output>5</output>
5%. Ans (5%).
<result>B</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 10 minutes 8 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?