A boat goes to 40 km upstream in 8 hours and down stream in 5 hours . What is the speed of boat in still water?

a) 6 km/hr

b) 5 km/hr

c) 6.5 km/hr

d) 7.5 km/hr

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dineshAptitude
A boat goes to 40 km upstream in 8 hours and down stream in 5 hours . What is the speed of boat in still water? a) 6 km/hr b) 5 km/hr c) 6.5 km/hr d) 7.5 km/hr