Question

Train A has length of X metres and speed u kilometre per hour. Train B has a length y metres and speed V kilometre per hour. The two trains take t minutes to cross Each Other when they travel parallel in opposite directions and 4t minutes to cross each other when they travel in the same direction. if u = 50 kilometer per hour what is the value of v

Answer 1

if u = 50 then v is also 50

Answer 2

V = 30 kilometer per hour.

Given:

Train A has length of X meters and speed u kilometer per hour.

Train B has a length y meters and speed V kilometer per hour.

The two trains take t minutes to cross Each Other when they travel parallel in opposite directions.

4t minutes to cross each other when they travel in the same direction.

u = 50 kilometer per hour.

To find:

The value of v in kilometer per hour.

Explanation:

Speed = $\frac{Distance}{Time}$  ⇒ Time = $\frac{Distance}{Speed}$

Relative speed of train when moves opposite to each other = u+v

Relative speed of train when moves same direction = u-v

Distance = X+Y from each case should be same.

From the given condition.

u+v = 4(u-v)

3u = 5v

v = 30 kilometer per hour

To find:

1)Train problem q: a train running at the speed of 60 km/hr crosses a pole in 9 seconds. what is the length of the train?

a.120 metres

.180 metres

c.324 metres

d.150 metres

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