A train leaves Bangalore railway station at a speed of 80 km/h for Mumbai. After 1 h another train leaves Bangalore railway station for Mumbai. at a speed of 100 km/h. How many hours, will the second train take to meet the first train?

Correct option is D

Given:
Speed of train leaves from Bangalore = 80kmph
Speed of train leaves from Bangalore after 1 hour = 100kmph
Formula Used:
Speed = $$\frac{distance}{time}$$​​

Solution:
Both trains meet after n hours after second train leaves.
Distance is same.
100n = (n + 1)80
100n = 80n + 80
n = 4
the second train will meet the first train.
= 4 hours