1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Kinematics boat question

  1. Sep 24, 2013 #1
    a boat takes 3.1 hours to travel 15 km down a river, then takes 5.1 hours to travel the same distance upstream. how fast is the river traveling.

    I found the boat is traveling at 4.84km/hr down the stream and 2.94 km/hr up it. not sure where to go next.

    Any help would be appreciated.
     
  2. jcsd
  3. Sep 24, 2013 #2

    phinds

    User Avatar
    Gold Member
    2016 Award

    d=rt
     
  4. Sep 24, 2013 #3
    Let's say the river's speed is 1 kph and the boat's speed is 2 kph then the boat will travel downstream at 3 kph and upstream at 1 kph. So when you go downstream you add the speeds, but when going upstream, you subtract the river's speed from the boat's speed. Try working that backwards.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Kinematics boat question
  1. Kinematics Question (Replies: 2)

Loading...