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Question

If  the speed of the boat in still water is xkmh and speed of the stream is ykmh .

S1 : upstream speed of the boat is (xy)kmh

S2 : downstream speed  of the boat is  (x+y)kmh


  1. S1 and S2 are true

  2. S1 and S2 are both false

  3. S1 is true and S2 is false

  4. S1 is false and S2 is true


Solution

The correct option is A

S1 and S2 are true


Upstream refers to the motion of the boat against the stream. Therefore, its speed is reduced. Hence speed of the boat in upstream is (xy)kmh

Downstream refers to the motion of the boat in the direction of the stream. Hence speed is   (x+y)kmh

Hence both the statements are true.

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