Question : A boy can swim in still water at a speed of 40 km/hr. If the speed of the current would have been 15 km/hr, then find the time in which the boy could swim 25 km upstream.
Option 1: 2 hours
Option 2: 2.5 hours
Option 3: 1 hour
Option 4: 3 hours
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Correct Answer: 1 hour
Solution : Distance = 25 km The difference between the speed in still water and the speed of the current = 40 km/hr –15 km/hr = 25 km/hr The time taken to swim a certain distance is given by the formula: Time = $\frac{\text{Distance}}{\text{Speed}}$ Substituting the values, we get: Time = $\frac{25}{25} = 1$ hour Hence, the correct answer is 1 hour.
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