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09 Sep 2008, 07:16
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If car X followed car Y across a certain bridge that is 21 miles 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.
(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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09 Sep 2008, 07:28
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klb15
(1) itself insufficient --> we need to know total time taken or average speed
(2) itself insufficient --> No info regarding X speed or time taken..
combined.
Y took the time = 21/30= 0.7 hr= 42*60 sec
X took the time = 42*60+1
suffcient.
C.
09 Sep 2008, 08:33
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x2suresh
clearly both independently are insufficient.
together,
say 3 sec after first car entered, second car entered, and exited after 3 sec itself, then its speed is the same as the first one. its like having a car trailing with a iron rod long enough to enter after 3 seconds behind the leading car, and they both exit at the same time. then speed of both are same.
but here , the trailing car has gained 1 sec. so
i.e it has taken 1 sec less.
time of the second car= time of first car - 1 sec.
lovely problem , from where did u get this???
