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If car X followed car Y across a certain bridge that is

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If car X followed car Y across a certain bridge that is [#permalink] New post 07 Aug 2005, 16:25
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If car X followed car Y across a certain bridge that is 21mile long, how many seconds did it take car X to travel across the bridge?

(1) Car X drove onto the bridge exactly 3 seconds after car Y drove onto the bridge and drove off the bridge exactly 2 seconds after car Y drove off the bridge.

(2) Car Y traveled across the bridge at a constant speed of 30 miles per hour.
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 [#permalink] New post 07 Aug 2005, 21:38
Let's say the speed of car X is: Vx
the speed of car Y is: Vy
the time needed by car Y is: t

from 1)
we know car X took one second less than car Y to travel the same distance - 21 miles.

So we get: Vx(t-1) = Vy*t = 21 => insuff

from 2)
we know Vy => insuff

combined , it is suff

C
  [#permalink] 07 Aug 2005, 21:38
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