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Q.

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

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a

30km/hr

b

 60km/hr 

c

 75km/hr

d

45km/hr

answer is C.

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Detailed Solution

Length of each train= 100 m 

Total distance traveled by train to cross each other 

=100+100=200m

Time is taken = 8 sec.

 Speed =2008=25m/s

Let the speed slow. The train is x m is. 

The speed of fast train is 2x m/s.

x+2x=253x=25x=253m/secx=253×185=30km/h

So, speed of faster train = 2x = 2 x 30 

= 60km/hr.

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