Question

Two trains of length 100m are running on parallel tracks one overtake other in 20 sec and the one crosses other in 10 sec calculate velocity of 2 trains

Answer 1

HERE IS YOUR SOLUTION;

◆ Let u & v be the velocity of the two trains named A & B.

While overtaking the relative velocity of train A with respect to B = u - v.

While crossing, the relative velocity of train A with respect to B = u + v.

◆Total distance to be travelled by Train A while crossing = 100 + 100 = 200.

So,

20 = 200 ÷ u-v

=> u - v = 10....1)

Also,

10 = 200 ÷ u + v

=> u + v = 20.......2)

◆◆ On solving the equation 1 & 2, we get;◆◆

u = 15 M/S of the train A / First Train.

v= 5 M/S of the train B / Second Train.

HOPE IT HELPS

Answer 2

Answer:

Hello mate,

Let u & v be the velocity of the two trains named A & B.

While overtaking the relative velocity of train A with respect to B = u - v.

While crossing, the relative velocity of train A with respect to B = u + v.

Total distance to be travelled by Train A while crossing = 100 + 100 = 200.

So,

   = 200 ÷ u-v

   => u - v = 10....1)

Also,

10 = 200 ÷ u + v

=> u + v = 20.......2)

On solving the equation 1 & 2, we get;

      u = 15 M/S of the train A / First Train.

      v= 5 M/S of the train B / Second Train.