A swimmer's speed with the current is 12 km/hr and the speed of the current is 5 km/hr. The swimmer's speed against the current and speed in still water are
A
5 and 12 km/hr
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B
2 and 7 km/hr
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C
7 and 2 km/hr
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D
3 and 7 km/hr
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Solution
The correct option is B2 and 7 km/hr Swimmer's speed in still water = swimmer's speed with the current − speed of the current =(12−5) km/hr =7 km/hr
Now, swimmer's speed against the current = swimmer's speed in still water − speed of the current =(7−5) km/hr =2 km/hr