Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

Two trains running in opposite directions cross a man standing on the

platform in 27 seconds and 17 seconds respectively and they cross each
other in 23 seconds. The ratio of their speeds is
the ratio of the speed is? we need to find that out?
can you please make the question more clear...


Let the lengths of the trains be x, y. Then the velocities of the trains are x/27, y/17. When they cross each other each one has to cover the other train's length and its own length hence the relative velocity is (x+y)/23=x/27+y/17. Solving this you get x/y=81/34
0 0 0
In this case since any one of the trains has to travel a total distance of x+y in 23 seconds it's (x+y)/23
woah. ur absolutely rite :O
Yup got it.. thanx..
no this is not the correct answer
Let the speeds of the two trains be x m/sec and y m/sec respectively.

Then, length of the first train = 27x metres,

and length of the second train = 17y metres.

27x + 17y/ x+ y = 23

27x + 17y = 23x + 23y

4x = 6y

x = 3 .
y = 2
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts