N:Dure wrote:Walking at 4/5 of his usual speed, a man is 10 minutes too late. find his usual time.
A. 81 minutes
B. 64 minutes
C. 52 minutes
D. 40 miuutes
E. none
We can plug in the answer choices, which represent the normal time. Since the problem includes 4/5, the correct answer is likely to be a multiple of 4 and 5. Let's try answer choice D.
Answer choice D: Normal time = 40 minutes.
Let distance = 200 miles.
Rate = 200/40 = 5 miles/minute.
4/5 rate = 4/5*5 = 4 miles/minute.
Time at slower rate = 200/4 = 50 minutes.
50-40 = 10 minute increase. Success!
The correct answer is
D.
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