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Equations Reducible to a Pair of Linear Equations in Two Variables

A and B are r...

Question

A and B are running a marathon. A started first and rested for an hour every third hour. B started 7 hours later at twice the speed of A, but took an hour of rest every second hour. After how many hours will B get ahead of A?

A

14

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B

18

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C

19

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D

21

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Solution

The correct option is D 21

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