Question : A boat can move upstream at 25 km/hr and downstream at 35 km/hr. What is the speed of the current?
Option 1: 10 km/hr
Option 2: 15 km/hr
Option 3: 5 km/hr
Option 4: 22.5 km/hr
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Correct Answer: 5 km/hr
Solution : Given: A boat goes at 35 km/hr downstream and at 25 km/hr upstream. Let the speed of the boat be $x$ km/hr and the speed of the current be $y$ km/hr. So, at downstream $x+y=35$ ---------(1) At upstream $x-y=25$ --------------(2) Solving both equations, we get $x=30, y=5$ Hence, the correct answer is 5 km/hr.
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