Question

A man swimming in a river finds that it takes him thrice the time to swim 2km upstream as it takes him to swim back.If the river flows at the rate of 1.5km/hr find the swimming speed of manin still water

Answer 1

let the speed in still water be x km/hr.
upstream the speed will be x-1.5
distance = 2km
time taken upstream = 2/(x-1.5)
..
downstream speed = x+1.5

distance = 2km
time taken = 2/(x+1.5)
..
he takes thrice the time upstream. 
2/(x-1.5) = 3*(2/x+1.5)
(x+1.5)(x-1.5)=3
x^2-2.25=3
x^2= 0.75
=0.87 km/hr

Answer 2

Answer:

2.5km/h

Step-by-step explanation:

speed upstream =(x-3/2)km/h and

speed while swimming back= (x+3/2)km/h.

so,the time (in hours ) taken to swim 1 km upstream= 1/x-3/2 and to swim back = 1/x+3/2

I hope this will help you.

plz mark it as brainliest answer.