1. A train is running at a speed of 40 km/hr and it crosses a post in 18 seconds. What is the length of the train?

1. 190 metres

2. 160 metres

3. 200 metres

4. 120 meters

Answer & Explanation

Answer:- 3

Explanation :-

Speed = 40*(5/18) m/sec = 100/9 m/sec

Length of Train(Distance) = Speed * Time

Length of Train(Distance) = (100/9)*18) = 200 metres

2. A train ,130 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. The length of the bridge is

1. 270 m

2. 245 m

3. 235 m

4. 220 m

Answer & Explanation

Answer:- 2

Explanation :-

Let’s suppose the length of bridge = b metres

Speed = Distance /Time

Speed (in metres) = 45 (5/18) = (25/2) m/s

25/2 = (130 + b)/ 30

375 = 130 + b

b = 245 metres

3. A train has a length of 150 meters . it is passing a man who is moving at 2 km/hr in the same direction of the train, in 3 seconds. Find out the speed of the train.

1. 182 km/hr

2. 180 km/hr

3. 152 km/hr

4. 169 km/hr

Answer & Explanation

Answer:- 1

Explanation :-

Length of train = 150 metres

Man’s speed = 2 km /h

Relative Speed = total distance / time

Relative Speed = 150/3 = 50 m/s = 50 *(18/5) = 180 km/h

Relative Speed = Speed of train – Speed of man ( beacause moving in the same direction )

180 = Speed of train – 2

Speed of train = 180 + 2 = 182 km/h

4. A train having a length of 240 m passes a post in 24 seconds. How long will it take to pass a platform having a length of 650 m?

1. 120 sec

2. 99 s

3. 89 s

4. 80 s

Answer & Explanation

Answer:- 3

Explanation :-

Speed of train = 240/24 = 10 m/s

Total distance = 240 + 650 = 890 m

Speed = distnace /time

10 = 890 /time

Time = 89 sec

5. A train 360 m long runs with a speed of 45 km/hr. What time will it take to pass a platform of 140 m long?

1. 38 sec

2. 35 s

3. 44 sec

4. 40 s

Answer & Explanation

Answer:- 4

Explanation :-

Speed = 45 Km/hr = 45*(5/18) m/s = 25/2 m/s

Total distance = 360+140 = 500 meter

Time = Distance/speed

= 500/(25/2) = 500*2/25 = 40 sec