3i-Infotech Company Numerical Ability Time Distance and Speed

Q. Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?

Option
A. 10
B. 12
C. 15
D. 20

Read Solution (Total 1)

Speed of the first train =120/10m/sec = 12 m/sec.

Speed of the second train =120/15m/sec = 8 m/sec.

Relative speed = (12 + 8) = 20 m/sec.

Required time =(120 + 120)/20sec = 12 sec.
12 years agoHelpfull: Yes(10) No(3)

3i-Infotech Other Question

Q. Two trains are running in opposite directions with the same speed. If the length of each train is 120 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is:

Option
A. 10
B. 18
C. 36
D. 72 Q. A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is:

Option
A. 45 m
B. 50 m
C. 54 m
D. 72 m