Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?  Choices.
A) 20 min  B) 22 min  C) 15 min  D) 18 min  E) 21 min
20 min   20 min   Speed Ratio = 1:4/5 = 5:4Time Ratio = 4:51 -------- 5 4 --------- ? 20 min
<result>A</result>
Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?