RRB JE exam Mathematics Important MCQs questions solved

Question No: 8

Two trains are moving in opposite directions @ 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the​​ faster train in seconds is:

A.

36

B.

45

C.

48

D.

49

Answer: Option C

 

Solution:

Relative speed = (60+​​ 90) km/hr

   =

https://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif

150 x

5

https://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gifm/sec

18

 

   =

https://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif

125

https://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gifm/sec.

3

Distance covered = (1.10 + 0.9) km = 2 km = 2000 m.

Required time =

https://www.indiabix.com/_files/images/aptitude/1-sym-oparen-h1.gif

2000 x

3

https://www.indiabix.com/_files/images/aptitude/1-sym-cparen-h1.gifsec = 48 sec.

125