A) 4.5 km/hr.
B) 5.25 km/hr.
C) 6 km/hr.
D) None of these
Correct Answer: A
Solution :
[a] Rate of stream = 1.5 km/hr Let speed of man in still water = u km/hr and distance = d \[\therefore \] Downstream speed = (u + 1.5) km/hr Upstream speed = (u ? 1.5) km/hr \[\therefore \] From question \[\frac{2d}{u+1.5}=\frac{d}{u-1.5}\] \[\Rightarrow 2u-3=u+1.5\] \[\Rightarrow u=4.5\,km/hr\]You need to login to perform this action.
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