Question: 26 -

A goods train runs at the speed of 72 km/hr and crosses a 250 m long platform in 26 sec. What is the length of the goods train? 

270 m

240 m

260 m

230 m

Answer:

270 m

Solution:

Speed = 72 * 5/18 = 20 m/sec.
Time = 26 sec.
Let the length of the train be x meters.
Then, (x + 250)/26 = 20
x = 270 m. 

Question: 27 -

The length of the bridge, which a train 130 m long and traveling at 45 km/hr can cross in 30 sec is?

200 m

225 m

250 m

245 m

Answer:

245 m

Solution:

Speed = 45 * 5/18 = 25/2 m/sec.
Time = 30 sec
Let the length of bridge be x meters.
Then, (130 + x)/30 = 25/2
x = 245 m.

Question: 28 -

A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 650 m long? 

100 sec

89 sec

150 sec

65 sec

Answer:

89 sec

Solution:

Speed = 240/24 = 10 m/sec.
Required time = (240 + 650)/10 = 89 sec.

Question: 29 -

A train 800 m long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 min, then the length of the tunnel is? 

360 m

540 m

500 m

130 m

Answer:

500 m

Solution:

Speed = 78 * 5/18 = 65/3 m/sec.
Time = 1 min = 60 sec.
Let the length of the train be x meters.
Then, (800 + x)/60 = 65/3
x = 500 m.

Question: 30 -

A train covers a distance of 12 km in 10 min. If it takes 6 sec to pass a telegraph post, then the length of the train is? 

140 m

120 m

100 m

90 m

Answer:

120 m

Solution:

Speed = (12/10 * 60) km/hr = (72 * 5/18) m/sec = 20 m/sec.
Length of the train = 20 * 6 = 120 m.