Question

15. Two trains 200 m and 160 m long, run at the rate of 60 km/h and 100 km/h respectively on parallel rails.
How long will it take a man sitting in the second train to pass the first train if they run in the opposite
direction?
A. 4 seconds
B. 4.4 seconds
C. 4.5 seconds
D. 3.24 seconds​

Answer 1

Step-by-step explanation:

1st.. speed+speed =.. 60+100=160km/hr

2nd.. distance +distance

200+160

360

time=distance

-----------

speed..

360÷160=2.25 second

Answer 2

Answer:

The correct answer of this question is 4.5 seconds.

Step-by-step explanation:

Given - Two trains 200 m and 160 m long, run at the rate of 60 km/h and 100 km/h respectively on parallel rails.

To Find - How long will it take a man sitting in the second train to pass the first train if they run in the opposite direction?

Railway lines are kept parallel because if they were made any other way, the train's wheels would go off the track and the train would crash.

Length of the first train is -  $200 m$.

Speed of the trains = $60$ × $\frac{5}{18}$  =  $\frac{50}{3}$ mps.

Length of the 2nd train is  $160$m.

Speed of the trains = $100$ × $\frac{5}{18}$ = $\frac{250}{9}$ mps.

Combined Relative Speed is  $\frac{400}{9}$ mps.

Time required for a man sitting in the 2nd train to pass the 1st train =

200 × 9/400 = 4.5 seconds

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