Question

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 the speed of the faster train is:
A.30 km/hr
B.45 km/hr
C. 60 km/hr
D.75 km/hr

Answer 1

Answer:  60 km/hr

Explanation:

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) = 3x

8

24x = 200

x = 25 .

3

So, speed of the faster train = 50 m/sec

3

  =  50 x 18 km/hr

3 5

  = 60 km/hr.

Answer 2

Answer:

Where do you get 18 from ?

Step-by-step explanation: