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A cyclist leaves her house at 8:00AM and begins travelling directly east at 20 km/h. Fif-...

A cyclist leaves her house at 8:00AM and begins travelling directly east at 20 km/h. Fif- teen minutes later, her friend, who lives 2 km directly south, gets in his car and begins to travel directly west at 50 km/h. Find the rate at which the distance between the cyclist and the driver is changing at 8:30AM.

Math   Calculus   
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