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If the speed of a boat in still water is 20km/hr and the speed of the current is 5km, then the time taken by the boat to travel 100 km with the current is?

a) 2 hours
b) 3 hours
c) 4 hours
d) 7 hours

Answer: c
Explanation: Relative speed = 20 + 5 = 25 km/hr
Time = $$\frac{{100}}{{25}}$$ = 4 hours

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