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Answer

Alan : 1 unit
Benedict : 3 units
David : 3 units + 5
Total : 7 units + 5 = 26
1 unit = (26 – 5)/7 = 3
3 units + 5 + 2 = 3 x 3 + 5 + 2 = 16

Ans : 16 km.

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Thanks . Really lost when trying to guide my nephew on speed questions. 

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You are welcome. Yes, some questions are not as straightforward and require deeper understanding.

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