Set 9: Linear Equations (Intermediate)

Explanation

Answer: B

Upstream speed 10 mph. Downstream speed 20 mph. Find speed of current.

Current speed?

✓ Correct

Detailed Explanation

Choice B is correct. b - c = 10. b + c = 20. Subtract: 2 c = 10. c = 5.

Key Steps:

•

The correct answer is 5

Why others are wrong:

A: Choice A is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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