contestada

the current in a river is 6 miles per hour. In her motorboat Marissa can travel 12 miles upstream or 16 miles downstream in the same amount of time. What is the speed of her motorboat in still water? is this a reasonable answer? Explain.

Respuesta :

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12:(v-6)=16:(v+6)
12(v+6)=16(v-6)
3(v+6)=4(v-6)
3v+18=4v-24
v=42(mph)