The number of days that it will take Oliver and Eva to be on the same page of the book is 11 days.
Based on the information given, the equation to solve the question will be:
43 + 3t = 21 + 5t
Collect like terms
5t - 3t = 43 - 21
2t = 22
t = 22/2
t = 11
Therefore, it'll take them 11 days.
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