A man went on a n miles trip. Its first 1/6 of the time was completed with a speed of r mile/hr. First 1/2 of the time was completed with a speed of 8 miles/hr. The first 1/3 of the time was completed with a speed of 12miles/hr. What is the man's average speed?
（1）n=20
（2）r=4
The Answer seems to be D
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Data Sufficiency Problem
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Mr.Hollywood
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krusta80
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I may be missing something, but can you please double check the wording of the problem?Mr.Hollywood wrote:A man went on a n miles trip. Its first 1/6 of the time was completed with a speed of r mile/hr. First 1/2 of the time was completed with a speed of 8 miles/hr. The first 1/3 of the time was completed with a speed of 12miles/hr. What is the man's average speed?
（1）n=20
（2）r=4
The Answer seems to be D
