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Re: If a man travels f miles an hour for t hours and r miles an hour for s [#permalink]
Bunuel wrote:
If a man travels f miles an hour for t hours and r miles an hour for s hours, what is his average rate in miles per hour for the entire distance traveled?

A. ft + rs
B. (ft + rs)/2
C. t/f + s/r
D. (ft + rs)/(t + s)
E. (ft + rs)/(t - s)



Average rate in miles per second = Total distance traveled/Total time taken

Total distance traveled = f*t + r*s = ft + rs
Total time taken for this distance = t + s
Therefore,average rate in miles per hour = (ft + rs)/( t +s)
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Re: If a man travels f miles an hour for t hours and r miles an hour for s [#permalink]
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Re: If a man travels f miles an hour for t hours and r miles an hour for s [#permalink]
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