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| Math Central | Quandaries & Queries |
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Question from Julie: At 3pm, Bruce headed north at 30 km/hr. 2 hours later, Lucy headed south at 40 km/hr. At what time will they be 340 km apart |
Hi Julie,
Bruce started by travelling north at 30 km/hr. Two hours later Lucy was ready to start. In the 2 hours Bruce had travelled 60 km so Bruce and Lucy are 60 km apart.
$340 - 60 = 280$ so you want to know the time when the distance between them increases by 280 km. Once Lucy starts moving how fast is the distance between them changing? How long does it take them to increase the distance between them to 280 km?
Penny
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