Answer:
Step-by-step explanation:
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21/2 or 10 1/2
x = -30 so it's D
1600 after 24 hours
100+100 = 200 after 6 hours
200+200 = 400 after 12 hours
400+400 = 800 after 18 hours
800+800 = 1600 after 24 hours
Runner B is going slower.
