Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?
Select the correct option: A) 11 min B) 56 min C) 13 min D) 20 min E) 19 min
Speed Ratio = 1:4/5 = 5:4Time Ratio   = 4:51 -------- 5 4 --------- ? è 20   Answer:20 min
<result>D</result>
Walking with 4/5 of my usual speed, I miss the bus by 5 minutes. What is my usual time?