lukeakalucas
17.08.2021 •
Mathematics
A village C is 12km upriver from a village D. It takes 20mins to go from D to C and back to D by boat. If the boat travels at 6 km per hr upriver and (6+y)km per hr downriver, what is the value of y?
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Ответ:
7x+2.8y
Step-by-step explanation:
(-2x+8.1y)-(-9x+5.3y).
combine like terms
-2x - (-9x) = 7x
8.1y - 5.3y = 2.8y