Topics

General Knowledge
General Science
General English
Aptitude
General Computer Science
General Intellingence and Reasoning
Current Affairs
Exams
Elementary Mathematics
English Literature

A train A is 180 m long, while another train B is 240 m long. A has a speed of 30 km/h and B's speed is 40 km/h. If the trains move in opposite directions, find when will A pass B completely?

A) 21 s
B) 21.6 s
C) 26.1 s
D) 26 s

Correct Answer:


B) 21.6 s

Description for Correct answer:
Total distance = x + y

= 180 + 240 =420 m

Active speed = u + V = \( \Large \left(30+40\right) \times \frac{5}{18} \)

= \( \Large \frac{70 \times 15}{15} m/s \)

Therefore, Required time = \( \Large \left(\frac{x+y}{u+v}\right)=\frac{420 \times 18}{70 \times 5} \)

= 21.6 s

Part of solved Trains questions and answers : >> Aptitude >> Trains

Comments

Similar Questions

1). A train of length 180 m, running by 72 km/h to cross the another train B which is running in the opposite direction to speed of 108 km/h and length is 120 m, in how much time?

A). 23 s

B). 12 s

C). 6 s

D). 30 s

2). A 110 m long train is running at a speed of 60 km/h. How many seconds, does it take to cross an another train of length 170 m, which is standing on parallel track?

A). 15.6 s

B). 16.8 s

C). 17.2 s

D). 18 s

3). Two trains of equal length are running on parallel lines in the same direction at 46 km/h and 36 km/h. The faster train passes the slower train in 36 s. The length of each train is

A). 82 m

B). 50 m

C). 80 m

D). 72 m

4). Two trains, of same length are running in parallel tracks in opposite directions with speeds 65 km/h and 85 km/h respectively. They cross each other in 6 s. The length of each train is

A). 100 m

B). 115 m

C). 125 m

D). 150 m

5). The ratio between the speeds of two train is 8 : 9. Second train covers 360 km in 4 h. Distance covered by first train in 3 h (in km) is

A). 240

B). 480

C). 120

D). 60

6). The average speed of a bus is three-fourth the average speed of a train. The train covers 240 km in 12 h. How much distance will the bus cover in 7 h?

A). 110 km

B). 115 km

C). 105 km

D). 100 km

7). Excluding stoppages, the speed of a train is 108 km/h and including stoppages, it is 90 km/h. For how many minutes does the train stop per hour?

A). 5

B). 9

C). 10

D). 6

8). Without stoppages, the speed of a train is 150 km/h and with stoppages, it is 100 km/h. How many minutes, does the train stop?

A). 20

B). 15

C). 25

D). 45

9). Two trains are running 40km/h and 20 km/h respectively, in the same direction. The fast train completely passes a man sitting in the slow train in 5 s. The length of the fast train is

A). \( \Large 23\frac{2}{9} \) m

B). 27 m

C). \( \Large 27\frac{7}{9} \) m

D). 23 m

10). The distance between two stations P and Q is 145 km. A train with speed of 25 km/h leaves station at 8:00 am towards station Q. Another train with speed of 35 km/h leaves station Q at 9:00 am towards station P. Then, at what time both trains meet?

A). 10:00 AM

B). 11:00 AM

C). 12:00 AM

D). 11:30 AM