-) Two trains are moving in opposite directons
at the speed of 50 and 70 km. per hour.
Their lengths are 150m and 100m. What is
time required for their crossing each other?
Answers
Step-by-step explanation:
answer: FRACTION OVER 5 SECONDS.
logic: Since the problem doesn’t mention, how far the trains are from each other when they start, we have to consider this problem as starting from the point when two trains APPROACH EACH OTHER and their front ends just meet.
From this point onwards, each train should be first considered AS IF it is moving and other is stationary. So EACH train would have to travel equal to its own length PLUS the length of the other train, which is 150+100 =250 meters, when it would have COMPLETELY PASSED EACH OTHER.
The time taken by the first train, at 50 km/hr speed , would be 18 seconds.
Similarly, the time taken by the second train, at 70 km/he speed, would be ~12.9 seconds.
Since the trains are simultaneously running in opposite directions, the NET TIME WOULD BE REDUCED, and would be equal to the difference of above 2 times: 18–12.9= ~5 seconds.
Therefore, they can cross each other in 7.5 seconds
hope this will help mark me as brainliest
