1.

A boat takes 9 h to travel a distance upstream and takes 3 h to travel the same distance downstream. If the speed of the boat in still water is 4 km/h, then what is the velocity of the stream?

Answer»

a. 4 km/h
b. 3 km/h
c. 6 km/h
d. 2 km/h

Answer :D


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