Bunuel wrote:
One day, Mr. Richards started 30 minutes late from home and reached his office 50 minutes late, while driving 25% slower than his usual speed. How much time in minutes does Mr. Richards usually take to reach his office from home?
(A) 20
(B) 40
(C) 60
(D) 80
(E) 100
We can let r = his usual rate and t = his usual time (in minutes). Since he started 30 minutes late from home and reached his office 50 minutes late, he actually spent 20 minutes more than his usual time traveling from his home to
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