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Peter Simpson from Castell Alun School argued as follows:
If N was 7 (or greater) the time delays would be greater than 59 minutes, the time for the car to travel to B (the walkers arrive in 60 minutes - N miles in an hour, the car arrives 1 minute earlier).
If N was 3 the distance would be 22km, but this would mean the holiday makers would split into 2 walkers and 1 car traveller, and as the problem states "they" for the car travellers the number of people in the car must be greater than 1.Momtchil Iliev from Drayton Manor School argued in a very similar way and added an explanation for how he calculated the distance by road:
Calculating Distance of road travelled by car