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705-805 (Hard)|   Distance and Speed Problems|                              
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Bunuel
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Bunuel,

Doesn't then "At the time" for statement 1

then mean that speed when passing so earlier speed of A before crossing each other will be different and hence NS ?

No. “Had averaged a speed of 70 miles per hour” does not mean P’s instantaneous speed at the exact moment of passing. It means that from the time P left Station X until the time the trains passed, P’s average speed was 70 miles per hour.
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