boat movin in direction of perpendicular to direction of current
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Speed in perpendicular directionhere means downstream speed.
If swimmer is moving at speed of 16 kmph in downstream. It means his speed is increased by current. And increase in speed is equal to current speed. So if you subtract current speed from downstream speed. You get swimmer speed in still water. So we have 16-3=13 kmph as speed of swimmer.
As current speed is 3 kmph. Suppose you pick swimmer from still water and drop against current to swim. As we know it's hard to swim against current. So speed decrease. And decrease in speed is equal to current speed.
We have 13-3=10 kmph.
If swimmer is moving at speed of 16 kmph in downstream. It means his speed is increased by current. And increase in speed is equal to current speed. So if you subtract current speed from downstream speed. You get swimmer speed in still water. So we have 16-3=13 kmph as speed of swimmer.
As current speed is 3 kmph. Suppose you pick swimmer from still water and drop against current to swim. As we know it's hard to swim against current. So speed decrease. And decrease in speed is equal to current speed.
We have 13-3=10 kmph.
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