A train needs 20 seconds to go through a 100 yard tunnel. The very same train going at a constant speed needs 50 seconds to go through a 330 yard tunnel. What is the length of the train?

Question

ganeshie8 · Answer

you need to setup two equations...  which part you need help with ?

ganeshie8 · Answer

call, 
length of train = x
speed of trian = s

lgbasallote · Answer

actually...it's doable with one equation only

ganeshie8 · Answer

use the relation, 

distance = speed*time

lgbasallote · Answer

since speed is constant

ganeshie8 · Answer

hmm

lgbasallote · Answer

something like distance/time = distance/time

maheshmeghwal9 · Answer

Is the speed of train in both cases is equal?
I mean it is given r nt?

maheshmeghwal9 · Answer

r=or*

maheshmeghwal9 · Answer

this question needs a clarification.

ganeshie8 · Answer

100+x = 20*s --------(1)
330+x = 50*s--------(2)

lgbasallote · Answer

something like this $$\huge \frac{100 + L}{20} = \frac{330 + L}{50}$$

lgbasallote · Answer

where L is length of train

lgbasallote · Answer

you guys do the rest ;)

ganeshie8 · Answer

oh..

maheshmeghwal9 · Answer

But my doubt is other @lgbasallote :/

ganeshie8 · Answer

proportions are cute :D

maheshmeghwal9 · Answer

I think we can't take 
same speed in both cases
as it is nt stated.

lgbasallote · Answer

speed is constant...that means speed is the same at both instances

maheshmeghwal9 · Answer

speed is constant in second case only
but wt about the first case.
question needs a clarification.

lgbasallote · Answer

*sigh*

lgbasallote · Answer

im not willing to do a grammar tutorial right now

maheshmeghwal9 · Answer

but it is a type of physics question too
physics do nt recommend this
@lgbasallote ur solution is right 100%
but question need clarification @CosmicStorm :/