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basic RTD question

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CEO
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basic RTD question [#permalink] New post 02 Feb 2007, 20:58
If a car goes 7 miles in 1 hour and 10 minutes, what is its speedin mph?

Answer:

R T = D

R = D / T

R = 7 / [7/6]

R = 42 / 7 = 6mph

my question is why do we not convert the 1 hour 10 minutes to 70 minutes? what is the logic behind it?
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 [#permalink] New post 05 Feb 2007, 00:22
You'll probably get a lot more replies on this if you posted it in the Math forum :-)

Since the answer is required in units of mph, its better to use numbers in those units in calculation. Hence its better to convert the time into 7/6. If you use time as 70 mins you'll get answer in miles per minute and then would have to convert it back to mph.
  [#permalink] 05 Feb 2007, 00:22
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