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Question

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 B 2 and 7 km/hr
Swimmer's speed in still water
= swimmer's speed with the current speed of the current
=(125) km/hr
=7 km/hr
Now, swimmer's speed against the current
= swimmer's speed in still water speed of the current
=(75) km/hr
=2 km/hr

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