Amazon Interview Question: - If 2 trains depart at the s... | Glassdoor

## Interview Question

Senior Manager, Vendor Management Interview Luxembourg (Luxembourg)

# - If 2 trains depart at the same time from 2 places

65 kilometers apart and one goes at 80 km/h and another one at 50 km/h when will they meet

0

40 and 25

Anonymous on Feb 24, 2012
17

they will meet 30 minutes later

Anonymous on Feb 26, 2012
2

combined travel speed of the trains is (80 + 50) = 130 km/h, which means they will meet after 65 / 130 hours, which is 0.5 hrs or 30 mins

Anonymous on Apr 28, 2015
1

Since it was not explicitly specified in the question, I'd elaborate that there are different cases.
If the trains are moving towards each other then the relative speed is 80+50 = 130 km/h. so it will take them (65/130 = 0.5) hours to meet.
Another case is they are going in the same direction, here we have two cases: The fast train is chasing the slow train, the relative speed will be (80-50 = 30 km/h) so they will meet after (65/30= 2 hours and 10 minutes). Or the slow train can be chasing the fast train and then they will never meet (assuming it is infinity non-looping track).

Mahmoud Hassan on Sep 6, 2016