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susan drove at an average speed of 30 miles per hour for the

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susan drove at an average speed of 30 miles per hour for the [#permalink] New post 25 Aug 2006, 09:02
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susan drove at an average speed of 30 miles per hour for the first 30 miles and then at an average speed of 60 miles per hour for the remaining 30 miles of the trip. if she made no stops during the trip, what was susan's average speed, in miles per hour, for the entire trip?

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 [#permalink] New post 25 Aug 2006, 09:10
40 is the correct choice:

Explantion:

(30+30) div (1+.5)
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 [#permalink] New post 25 Aug 2006, 09:15
40

1st half: (30)t1=30 --> t1=1h
2nd half: (60)t2=30 --> t2=1/2h

Total Avrg S.=120/3=40m/h
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 [#permalink] New post 25 Aug 2006, 16:47
lan583 wrote:
Ruby wrote:
40 is the correct choice:

Explantion:

(30+30) div (1+.5)


should it be (1+2) instead of (1+.5)?


:no it should be 1 + 0.5, at 60 mph you will cover 30 miles in 1/2 an hour
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 [#permalink] New post 26 Aug 2006, 06:32
Total distance = 60
Total time = 30/30 + 30/60 = 1.5

Avg speed = d/t = 60/1.5 = 40
  [#permalink] 26 Aug 2006, 06:32
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susan drove at an average speed of 30 miles per hour for the

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