A) u + 2v = 15 u - v = 6
B) u + v =16 u - v = 8
C) u + v = 10 u - v = 2
D) 2u + v = 18 u - 2v = 3
Correct Answer: C
Solution :
(c): Let u, v be respectively speed of rowing and speed of river. \[\frac{\text{distance}}{\text{speed}}=\text{time}\Rightarrow \frac{20}{u+v}=2\] \[\Rightarrow u+v=10\] Also, \[\frac{4}{u-v}=2\Rightarrow u-v=2\]You need to login to perform this action.
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