- A3
- B1
- C4
- D2
Step-by-Step Solution
From b + s = 10, b = 10 - s. Substitute into b - s = 6: (10 - s) - s = 6, 10 - 2s = 6, 2s = 4, s = 2 km/h.
Answer: D) 2
A man rows downstream and upstream.
Let boat speed be b km/h and stream speed s km/h.
Given b + s = 10 (downstream) and b - s = 6 (upstream),
use substitution to find the stream speed s.
Class 10Substitution MethodAlgebra — Systems of Equations
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