Question

A train leaves Bangalore railway station at a speed of 80 km/hr 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?
1. 5 h
2. 3 h
3. 4 h
4. 6 h

Answer 1

Correct Answer - Option 3 : 4 h

Given:

Speed of train leaves from Bangalore = 80kmph

Speed of train leaves from Bangalore after 1 hour = 100kmph

Formula:

Speed = distance/time

Calculation:

Both trains meet after n hours after second train leaves.

Distance is same.

⇒ 100n = (n + 1)80

⇒ 100n = 80n + 80

⇒ n = 4

∴ After 4 hours, second train will meet first train.