   # Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds...

+1 vote
177 views

Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then what is the speed of the faster train ? posted Jan 14, 2016

+1 vote

Let the speed of the slower train be x m/sec.

Then, speed of the faster train = 2x m/sec.

Relative speed = (x + 2x) m/sec = 3x m/sec.

(100 + 100) / 8 = 3x

So, x = 25/3

So, speed of the faster train = 50/3 m/sec answer Jan 14, 2016

Similar Puzzles

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. What is the time (in seconds) which they take to cross each other?

+1 vote

Two trains each 333 meter long, are running in opposite directions on parallel tracks.
If their speeds are 45 km/hr and 66 km/hr respectively, then what is the time taken by the faster train to pass the driver of slower one?

+1 vote

Two trains each 414 meter long, are running in opposite directions on parallel tracks. If their speeds are 39 km/hr and 69 km/hr respectively, what would be the time taken by the slower train to pass the driver of the faster one?