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  • 15-11-2019
  • Mathematics
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a boat going upstream at 4 mph then travels downstream at 10 mph. what is the rate of the boat in still water​

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MathPhys
MathPhys MathPhys
  • 15-11-2019

Answer:

7 mph

Step-by-step explanation:

If b is the rate of the boat, and s is the rate of the stream, then:

b − s = 4

b + s = 10

Solve the system of equations with substitution or elimination.  Using elimination, add the equations together:

2b = 14

b = 7

The boat's rate is 7 mph.

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