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07 Nov 2020, 22:50
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Bunuel
Bunuel /chetan2u / JeffTargetTestPrep,
I still face the confusion in understanding the phrases and visualization.
Earlier: X was behind the Y and difference in time was 3 seconds,
Later: X was still behind the Y and difference in time was 2 seconds, implying that speed of X must be more than speed of Y to compensate 1 second.
D R T
X: 0.5 >30 t
Y: 0.5 30 t+x
Now i stuck. Can you please help me?
Thanks!
07 Nov 2020, 23:51
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Raxit85
Take Y DRT : 0.5—30—(t+1)....t+x is t+(3-2) or t+1. Find t from this and that is you answer.
We are interested in just time, so we should concentrate on time.
We know speed and distance for Y, which will give us time taken by Y.
Time taken by X is 1 second less, so subtract 1 from the above found time.
06 Aug 2023, 06:31
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Statement 1
Explanation about the relation mentioned in Statement 1
Let's break down the information given in the statement:
Car X drove onto the bridge exactly 3 seconds after Car Y drove onto the bridge.
Car X drove off the bridge exactly 2 seconds after Car Y drove off the bridge.
Now, let's assume the time it takes for Car Y to cross the bridge is "t" seconds.
Car Y's time on the bridge = t seconds.
Car X's time on the bridge = t + 3 seconds (Car X drove onto the bridge 3 seconds after Car Y).
Car X's time on the bridge = t + 2 seconds (Car X drove off the bridge 2 seconds after Car Y).
Now, to find the time it takes for Car X to cross the bridge, we can subtract the time Car X takes from the time Car Y takes:
Time difference = (t + 2) seconds - (t + 3) seconds
Time difference = t + 2 - t - 3
Time difference = -1 second.
So, Car X takes 1 second less than Car Y to cross the bridge.
Since we do not know the time Car Y takes to cross the bridge, Statement 1 is insufficient.
Statement 2 :
From Statement 2 we can calculate the time it takes for Car Y to cross the bridge. But no information about Car X, hence insufficient.
Combined :
Sufficient. As we know the time it takes Car Y to cross the bridge from S2 and that Car X takes 1 second less than Car Y from S1
Explanation about the relation mentioned in Statement 1
Let's break down the information given in the statement:
Car X drove onto the bridge exactly 3 seconds after Car Y drove onto the bridge.
Car X drove off the bridge exactly 2 seconds after Car Y drove off the bridge.
Now, let's assume the time it takes for Car Y to cross the bridge is "t" seconds.
Car Y's time on the bridge = t seconds.
Car X's time on the bridge = t + 3 seconds (Car X drove onto the bridge 3 seconds after Car Y).
Car X's time on the bridge = t + 2 seconds (Car X drove off the bridge 2 seconds after Car Y).
Now, to find the time it takes for Car X to cross the bridge, we can subtract the time Car X takes from the time Car Y takes:
Time difference = (t + 2) seconds - (t + 3) seconds
Time difference = t + 2 - t - 3
Time difference = -1 second.
So, Car X takes 1 second less than Car Y to cross the bridge.
Since we do not know the time Car Y takes to cross the bridge, Statement 1 is insufficient.
Statement 2 :
From Statement 2 we can calculate the time it takes for Car Y to cross the bridge. But no information about Car X, hence insufficient.
Combined :
Sufficient. As we know the time it takes Car Y to cross the bridge from S2 and that Car X takes 1 second less than Car Y from S1
