Question

hiiii anwer this question... please......
I am in trouble

Answer 1

16.
Speed of boat in still water=8km/h
let speed of stream=x
speed downstream=8+x
distance to be travelled =30km
time =3hr
Equation:3*(8+x)=30
8+x= 10
x=10-8
x=2
The speed of stream :2km/h

15.
Speed of boat in still water=7km/h
let speed of river=3km/h
speed upstream:=7-3=4km/h
distance=24km
time=24km/4km/h
=6hr.
Time = 6hr.

14.
Speed of the boat in still water=6km/h
let speed of river=3km/h
speed downstream=9km/h
distance=45km
time taken for the journey=45/9
=5hr.