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The time it took car A to travel 400 miles was 2 hours less

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The time it took car A to travel 400 miles was 2 hours less [#permalink] New post 22 Nov 2006, 11:50
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The time it took car A to travel 400 miles was 2 hours less than the time it took car B to travel the same distance. If car A's average speed was 10 MPH greater than that of car B, what was car B's average speed, in MPH?
(A)20
(B)30
(C)40
(D)50
(E)80
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 [#permalink] New post 22 Nov 2006, 12:01
C) 40

For B:
If avrg speed (x) = 40, then time (t) = 10 --> (x)(t)=400

For A:
(x+10)(t-2)=400 --> (40+10)(10-2)=(50)(8)=400 --> BINGO
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 [#permalink] New post 26 Nov 2006, 15:39
C)40

Solving for X:
(400/X)+2 = 400/(X+10)
  [#permalink] 26 Nov 2006, 15:39
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The time it took car A to travel 400 miles was 2 hours less

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