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Re: A train takes 15 seconds to cross a bridge at 50 mph, and at [#permalink]
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Carcass wrote:
A train takes 15 seconds to cross a bridge at 50 mph, and at the same speed takes 10 seconds to cross the same bridge when the train's length is halved.

Quantity A
Quantity B
Length of the bridge
Original length of the train


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.



------- APPROXIMATION STRATEGY------------
A train crosses a bridge when it's tail leaves the end of bridge i.e. it covers the distance equal to (Train length + Bridge length)

This Train takes 5 seconds less to cross the bridge if its length is halved.

That means these 5 seconds were taken to cross this length which is cut off now (given as half of train's length).

So, 5 seconds for covering half the length of train ------> meaning train covers 1.5 times its length in 15 seconds

So, bridge's length must be half of train's length

Thus answer is B
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Re: A train takes 15 seconds to cross a bridge at 50 mph, and at [#permalink]
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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