Problems on Trains

1 )

Find the time taken by a train 180m long, running at 72kmph in crossing an electric pole

9 seconds

10 seconds

18 seconds

28 seconds

31 seconds

View Solution

Answer :

Speed of the train =72*5/18m/s =20 m/s

Distance moved in passing the pole = 180m

Required time = 180/20 = 9 seconds

2 )

A train 140 m long running at 60kmph.In how much time will it pass a platform 260m long.

18 Seconds

21 Seconds

24 Seconds

31 Seconds

34 Seconds

View Solution

Answer :

Distance travelled =140 + 260 m =400 m,

speed = 60 * 5/18 = 50//3 m

time=400*3 / 50 = 24 Seconds

3 )

A man is standing on a railway bridge which is 180 m. He finds that a train crosses the bridge in 20 seconds but himself in 8 sec. Find the length of the train and its speed

S =15 m/s and L = 120 m

S =18 m/s and L = 124 m

S =35 m/s and L = 120 m

S =15 m/s and L = 110 m

S =18 m/s and L = 120 m

View Solution

Answer :

Solution:

i)D=180+x

T = 20 seconds

S= 180+x / 20 ------------ 1

ii)D=x

T=8 seconds

D=ST

x=8S ------------- 2

Substitute 2 in 1

S=180 + 8 S / 20

S=15 m/s

Length of the train, x is 8 *15 = 120 m

4 )

A train 150m long is running with a speed of 68 mph In what time will it pass a man who is running at a speed of 8kmph in the same direction in which the train is going

12 sec

7 sec

5 sec

13 sec

9 sec

View Solution

Answer :

Relative Speed = 68 - 8 = 60 kmph *5/18 = 50/3 m/s

time = 150 * 3 /50 = 9 sec

5 )

A train 220m long is running with a speed of 59 k mph In what time will it pass a man who is running at 7 kmph in the direction opposite to that in which train is going.

15sec

12sec

19sec

20sec

23sec

View Solution

Answer :

Relative Speed = 59+7=66kmph*5/18 = 55/3 m/s

time= 220/55 * 3 = 12sec

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