Aptitude - Problems on Trains - Discussion

To solve this problem, we need to first determine the speed of the train. We can use the formula:

Speed = Distance/Time.

From the given information, we know that the length of the train is 240 meters and it passes a pole in 24 seconds. Therefore, the speed of the train is:

Speed = 240/24.
Speed = 10 m/s.

Now, we need to find out how long it will take for the train to pass a platform that is 650 meters long. Let's assume that the front of the train just reaches the beginning of the platform at time t=0.

As the train passes over the entire length of the platform, it will cover a distance equal to the sum of the length of the train and the length of the platform.
Total distance to be covered = 240 + 650 = 890 meters

To find the time taken for the train to cover this distance, we can use the formula:

Time = Distance / Speed

Time = 890 / 10
Time = 89 seconds

Therefore, it will take the train 89 seconds to pass a platform that is 650 meters long.

Here is the solution

Just apply required time formula.
Required time = distance /speed.

In this case, train Len = 240 + platform = 650/speed.
And req tiime = 240 + 650/10 = 89 m/s thats it.

Why did we add 240 to 650?

Since we only want to find the time taken to cover 650m.

Anyone, please explain me.

I THINK ANS IS 65 SEC BECAUSE;

Directly calculate the answer;
240 = 24,
650 = X.

Cross multiplication.
240X = 15600.
X = 15600/240.
X = 65 Sec.

For 240m = 24sec.
==> 1m = 1/10 sec.

Total distance need to travel is (240+650) = 890m.
==>For 890m = 890/10 sec,
= 89Sec.

Hi friends,

I tell you the exact reason for why we will and 240 with the plate from length.

Because after 65 seconds the head only reach the last point of the palate form but if the train crosses the plate form then the train will go 240 m ahead so the total meter will be 890. Or you want to calculate time.

So, the time will be 65 s to the platform and another 24 s to cross that platform.

So, it can also add as 65 s + 24 s = 89 s.

@All.

When train at starting point of platform and its a start of train so remaining train is till not on platform so train will take platform length and train length too. That"s why we have to add both.

Thanks for explaining that option B is correct.

Thanks for explaining that option B is correct.

I think there's no need to add 240. They have only asked what's the time to cross platform. Thus the answer must me 65secs.