Learn about new technologies!

What is the correct answer?


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:

A. 10

B. 18

C. 36

D. 72

Please do not use chat terms. Example: avoid using "grt" instead of "great".