Question

A boatman can row a boat in still water at a maximum 5km/hr. What will be the boat’s resultant velocity if,
A. he is going upstream against a current of 2km/hr.
B. His boat is going in the direction of the current.
C. The boatman wants to go across the river.

Answer 1

Explanation:

Let the distance of the destination be x km.

Speed of boat downstream  =(5+1) km/hr =6 km/hr

Speed of boat upstream =(5−1)=4 km/hr

Then, 6x+4x=1        

⇒122x+3x=1

⇒x=512=2.4 km

Answer 2

Answer:

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