Question

Two trains each 800 m long are travelling in
opposite direction with velocity of 36 km/h.
The time of crossing is
(1) 80 s
(2) 40 s
(3) 22.22 s
(4) 11.11 s ​

Answer 1

Answer:

The time taken to cross trains each other is 8 sec i.e. option 1.

Explanation:

The qyestion is related to relative velocity.

Actually each train has length of 800m meter which means total distance cover by the trains together while crossing each other is 800+800=1600m.

Now,

Speed of each train = 36km/h =10m/s

Since both the trains are traveling in oppoeite directions hence their relative velocity, V= 10+10 = 20m/s

Now, the total time taken to cross each other is T= S/V = 1600/20 = 80 s.

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Answer 2

Answer:

it's 80secs...

Explanation:

firstly add up distance of train that's 1600

then convert km to m/s that's 10m/s

now add velocity of trains 20m/s

by using formula s=V/t

we get the answer 80m/s