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Question. 1 :

1.     Mary can run at a top speed of 4.2m/s, whereas Deema can run only at 3.4m/s. They are to race a distance of 200m, starting at the same point. If the race is to end in a tie, how much sooner should Deema start running before Mary does.

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Question. 2 :

 I can not remember any of my revision can someone help me, my exam is tomorrow.

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