X and Y are two stations that are 280 km apart. A train starts at a certain time from X and travels towards Y at 60 km/h. After 2 hours, another train starts from Y and travels towards X at 20 km/h. After how many hours does the train leaving from X meet the train which left from Y?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 4 hours
Total distance = 280 किमी
Train from X covers a distance = 60 × 2
⇒ 120 km
The rest distance = 280 - 120 = 160 km
The speed of the train from station Y = 20 kmph
The relative speed of both the train combined = 60 + 20
⇒ 80 kmph
⇒Time = distance / speed
⇒ Time = 160 / 80
⇒ 2 hours
Total time = 2 + 2 = 4 hours