Math CentralQuandaries & Queries


Question from jake, a student:

two jets are traveling towards each other and are 4000 km apart. the rate of one jet is 100 km/h faster than the rate of the other. if the jets pass each other after 2.5 hrs what is the rate of speed of the faster jet?

Hi Jake,

Suppose the slower jet travels at s km/h. How fast does the faster jet travel? At what rate is the distance between them decreasing? Use that fact that rate = distance/time to set up an equation and solve it for s.


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