A) 8 km/hr.
B) 8.5 km/hr.
C) 9 km/hr.
D) 9.5 km/hr.
Correct Answer: C
Solution :
[c] Let speed in downstream \[=\left( x+y \right)\] Speed in upstream \[=\left( x-y \right)\] \[\therefore \] \[4(x+y)=40\] x+ y = 10 ?(1) and \[3(x-y)=24\] x ? y = 8 ?(2) By (1) and (2) x = 9, y = 1 \[\therefore \] Speed in still water is 9 km/hYou need to login to perform this action.
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