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Could you explain how we determine that Ben’s sister had travelled 800 m from home when she met Ben at 7:12 AM?

Thanks.

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Assume Ben’s speed is 8 Km/Hr and Sis is 4 Km/ Hr
In 12 mins Ben would have traveled 8 x 0.2 hrs (12 mins) = 1.6 Km
Sis would have traveled 4 x 0.2 hrs = 0.8 Km
1.6 – 0.8 = 0.8 Km

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Can you explain how you come to this assumption ‘Assume Ben’s speed is 8 Km/Hr and Sis is 4 Km/ Hr’ ?

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Thank you for your response.

I think the question is missing information to determine the distance in part (b).

 

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