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Aptitude :: Problems on Trains

@ : Home > Aptitude > Problems on Trains > General Questions

Overview

Important Formulas

Exercise

General Questions

Data Sufficiency 1

Data Sufficiency 2

Data Sufficiency 3

"It takes a very long time to become young."

16.A train travelling at a speed of 75 mph enters a tunnel 3 miles long. The train is

mile long. How long does it take for the train to pass through the tunnel from the

moment the front enters to the moment the rear emerges?

A.2.5 min B.3 min

C.3.2 min D.3.5 min

Answer & Explanation

Answer: Option B

Explanation:

Total distance covered=7+

1miles

2 4

=15

miles.4

Time taken=15

hrs4 x 75

=1

hrs20

ems on Trains - Aptitude Questions and Answers Page 4 http://www.indiabix.com/aptitude/problems-on-train

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2/3

=1

x 60 min.20

= 3 min.

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17. A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1

minute, then the length of the tunnel (in meters) is:

A.130 B.360

C.500 D.540


Answer: Option C

Explanation:

Speed = 78 x5

m/sec=65

m/sec.18 3

Time = 1 minute = 60 seconds.

Let the length of the tunnel be x metres.

Then,800 + x

=65

60 3

3(800 + x) = 3900

x = 500.


18. A 300 metre long train crosses a platform in 39 seconds while it crosses a signal pole

in 18 seconds. What is the length of the platform?

A.320 m B.350 m

C.650 m D.Data inadequate


Answer: Option B

Explanation:

Speed = 300 m/sec =50m/sec.18 3

Let the length of the platform be x metres.

Then,x + 300

=50

39 3

3(x + 300) = 1950

x = 350 m.


19. A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds.

Its length is:A.50 m B.150 m

C.200 m D.Data inadequate


Answer: Option B

Explanation:

Let the length of the train be x metres and its speed by y m/sec.

Then,x

= 15 y =x

.y 15

x + 100= x


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25 15

15(x + 100) = 25x

15x + 1500 = 25x

1500 = 10x

x = 150 m.


20. A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20

seconds respectively. What is the speed of the train?A.69.5 km/hr B.70 km/hr

C.79 km/hr D.79.2 km/hr


Answer: Option D

Explanation:

Let the length of the train be x metres and its speed by y m/sec.

Then,x

= 8 x = 8yy

Now,x + 264= y

20

8y + 264 = 20y

y = 22.

Speed = 22 m/sec = 22 x18

km/hr = 79.2 km/hr.5


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Read more:

Problems on Trains - Important Formulas

Problems on Trains - Data Sufficiency 1

Problems on Trains - Data Sufficiency 2Problems on Trains - Data Sufficiency 3

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