Question

6. 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?

Answer 1

Answer:

Let the Speed of boat in still water=x km/hr

Let the speed of stream be=y km/hr

For upstream=x-y

For downstream=x+y

Time=Distance/Time

time=16/x+y =2.....equation1

=16/x-y =4.....equation 2

Let u=1/x+y

v=1/x-y

16u+2v