Aptitude - Problems on Trains - Discussion

Please let me know about the solution.

I'm not getting this. someone help me.

The solution is correct.

If we don't add 240 we will get only the time taken for the engine to travel and not the entire train.

So we have to add it.

I have a simple solution.
Speed = distance/time;
240/24 = 10 m/s is speed of train.

Now pltform length is 650 m.
We have speed of train nd platform length.
so, time for crossing platform=length of platform/speed of train(t=d/s),
T(time for crossing platform)=650/10 = 65.

Here 65 is the time taken by the part of engine to cross the platform, not by the entire train.
24 second is time taken by train to reach to the pole + 65 sec is time tacken by train to cross the platform = 89 sec.

Speed = total (distance/time).
240/24sec = 10 ms.
So, 650/10ms = 65 sec.

I think we don't need to add both the meters of the platform.

Why can't the answer be 65 according to my explanation?

Speed of the train=(distance /time).

Hence,
240 ÷ 24 =10.
Speed of train is 10 m/s.
Time =distance /speed of the train.
For a 650m platform hence distance is 650.
Time=650m/10m/s.

Hence,
Time =65 sec.

I also think that 65 is the correct answer.

I believe the right answer is 65 Sec.

Because train speed is 10m/Sec and to cross 650-meter bridge it took 65 sec to pass that.

The answer has to be 89 seconds if it is given that this pole is a point of reference on the platform or bridge but is is not mentioned that pole is on the platform thus both the answers are correct it's a tricky question because of the language of the question (consider the question where we give conditions such as a man is standing on a platform that would help you to understand the concept better).

I Can't understand. Please explain me.