Aboat is able to move throught still water at 20m/s. it makes a round trip to a town 3.0km upstrea. if the river flows at 5m/s, the time required for this round trip is

t=320s

Explanation:

Given Data

Boat speed=20 m/s

River flows=5 m/s

Total trip of distance d=3.0km = 3000m

To find

Total time taken

Solution

As

Here we have two conditions

First when boat moves upward and the river pushing back.then velocity is given as

velocity=20m/s-5m/s

velocity=15 m/s

Time for that velocity

Now for second condition when river flows and boat speed on same direction

velocity=20m/s+5m/s

velocity=25 m/s

Time taken for that velocity

Now the total time

this is a good question! i'll do some research and come back when i have the answer!

it has to be b, about 97 percent.