Question

An express train is running at 72km/hr cross a pole in 18 sec. Find its length.​

Answer 1

Step-by-step explanation:

Speed of the train =72 km/hr= 20 m/s

Length of the train = 18 × 20 = 360 m

Length of (train + platform) = 20 × 33 = 660 m

∴ Length of the platform = 660 m – 360 m = 300 m.

Answer 2

Answer:

The train crossing the platform means that

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.At the time the timer is stopped, i.e, 23 seconds later, the train’s rear most part is at the end of the platform.

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.At the time the timer is stopped, i.e, 23 seconds later, the train’s rear most part is at the end of the platform.This means that in 23 seconds, the train has traveled a distance equal to the length of the platform + the length of the train.

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.At the time the timer is stopped, i.e, 23 seconds later, the train’s rear most part is at the end of the platform.This means that in 23 seconds, the train has traveled a distance equal to the length of the platform + the length of the train.72 km/h = 20 m/s. In 23 seconds at this speed, the train travels 20 x 23 = 460 meters.

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.At the time the timer is stopped, i.e, 23 seconds later, the train’s rear most part is at the end of the platform.This means that in 23 seconds, the train has traveled a distance equal to the length of the platform + the length of the train.72 km/h = 20 m/s. In 23 seconds at this speed, the train travels 20 x 23 = 460 meters.Length of platform + length if train = 460m.

The train crossing the platform means thatAt the time the timer is started, the train’s front most part is at the starting of the platform.At the time the timer is stopped, i.e, 23 seconds later, the train’s rear most part is at the end of the platform.This means that in 23 seconds, the train has traveled a distance equal to the length of the platform + the length of the train.72 km/h = 20 m/s. In 23 seconds at this speed, the train travels 20 x 23 = 460 meters.Length of platform + length if train = 460m.Length of train = 460 - length of platform = 460–260 = 200m.

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