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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 13 May 2005, 12:22
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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 miles per hour greater than that of car B, what was car B's average speed, in miles per hour?

a) 20
b) 30
c) 40
d) 50
e) 80
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 [#permalink] New post 14 May 2005, 04:21
or you can find it through time.

40/(t-2)=10+40/t

t=10 and average speed 400/10=40
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 [#permalink] New post 16 May 2005, 04:59
Sorry, could I get some step by step explanations of these answers? I know the formula is:

Distance=Rate * Time

But I can't seem to see how you guys came up with your equations.
Thanks!
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 [#permalink] New post 16 May 2005, 05:38
sorry i had a typo. the equasion was supposed to read 400/(t-2)=10+400/t

average speed of A equals av speed of B + 10.
  [#permalink] 16 May 2005, 05:38
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