Question

Two trains A and B are running in the same direction on parallel tracks with the uniform speed of 90 Km/ hr and 108 Km/hr. In how much time the B train will overtake the A train if length of A and B is 300 Meter and 200 Meter respectively. * 2 points A.20

Answer 1

Answer:

Combined Speeds = 72 km/h & 36 km/h = 108 km/h ~ 108,000 metres divided by 3,600 seconds (hour) = Combined Travel Rate of 30 metres per second.

Combined Length of Trains are 90 metres & 120 metres = Total Length of 210 metres

210 metres divided by 30 metres per second = 7 seconds

Answer: It will take 7 seconds for both Trains to completely pass each other

Answer 2

Answer:

1 min

Explanation:

relative motion:- B train ko rest pe lekar uski speed train A se ghata dena

abh A train ke speed 5m/s rahe jayengee

abh 300(length of train) ÷5 = 60sec