Question

Two trains, each 100 meters long take 60 seconds to cross each other if traveling in the same
direction and 10 seconds to cross each other when traveling in opposite direction. Find the
speed of the faster train.
1. 30 kmph
2.35 kmph
3. 42 kmph
4. 50 kmph
5. 84 kmph​

Answer 1

Answer:

Approach:

- Assume the speed of trains be S1 and S2.

- Total Distance = length of both trains: 100+100 = 200 m

- Time taken T1 = 60 sec, T2 = 10 sec

- S1+S2 = 200/10 => 20 m/s ....1

- S1-S2 = 200/60 => 10/3 m/s ....2

- Add (1)&(2), We get S1 = 35/3 m/s and further S2 = 25/3 m/s

- speed of the faster train(in Kmph) 35/3*18/5 = 42Kmph

Option C