Question

A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water? 

a) 4 kmph 

b) 6 kmph 

c) 8 kmph 

d) data inadequate

Answer 1

Correct option: b) 6 kmph

Explanation:

Rate downstream=(16/2) kmph= 8 kmph; rate upstream= (16/4) kmph=4 kmph speed in still water =1/2*(8+4) kmph =6 kmph