two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 80 kmph and 70 kmph respectively. in what time will they cross each other completely?
two trains each 250 m in length are running on the same parallel lines in opposite directions with the speed of 80 kmph and 70 kmph respectively. in what time will they cross each other completely?
D = 250 m + 250 m = 500 m
RS = 80 + 70 = 150 * 5/18 = 125/3
T = 500 * 3/125 = 12 sec
The problem asks for the time it takes for two trains to pass each other completely in English. Here's the solution:
Step 1: Calculate the total distance to be covered.
Both trains are 250 m long, so the total distance they need to cover to pass each other is 250 m + 250 m = 500 m.
Step 2: Calculate the relative speed of the trains.
When moving in opposite directions, their speeds add up. Therefore, the relative speed is 80 kmph (speed of first train) + 70 kmph (speed of second train) = 150 kmph.
Step 3: Convert relative speed to meters per second.
1 kmph is equal to 5/18 meters per second. So, 150 kmph is equal to 150 * (5/18) = 41.67 meters per second.
Step 4: Calculate the time taken to cross each other completely.
Time is equal to distance divided by speed. Therefore, the time it takes for the trains to pass each other completely is 500 meters / 41.67 meters per second = 12 seconds.
Therefore, it will take 12 seconds for the two trains to cross each other completely.
