Walking with 5/4 of my usual speed, I miss the bus by 5 minutes. What is my usual time?  Choose the correct choice from the following choices:  A) 18  B) 19  C) 20  D) 22  E) 24
Speed Ratio = 1:5/4 = 4:5   Time Ratio = 5:4   1 -------- 5 4 --------- ? è 20   ANSWER:20
<result>C</result>
Walking with 5/4 of my usual speed, I miss the bus by 5 minutes. What is my usual time?