Task: Question Answering
Input (English): Context: The most exciting event happened in aquatic centre . 400 m Freestyle women was totally awesome , Adlington from Britain won from an American woman who had hold to her 1st position from the start only to be taken away by Adlington on the last second . The same thing happened in 400 m Freestyle Relay Men , French was leading the way only to be taken on the last second by USA . Both races were incredible . 
Question: Why were these swimmers able to take the lead at the last second to win the event ?
Output (English): Holding the lead throughout the event is tiring and requires a lot stamina and at the end of the event it is difficult to hold off on someone who is right on your tail.