Two trains staring at the same time, having length 200m each are moving in same direction. If the speed of each train is 30km/h and 35km/h respectively, find when they will cross each other
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Answer:
First we will convert kilometers into meters as distance between them is in meters.
30km/h = 30 ×5/18 mps = 150/18 mps = 8.3 m/s
35 km/h = 35 ×5/18 mps = 175/18 mps =9.16 m/s
Taking it into perspective we will count distance covered by each train during each second.
We will see that at these trains meet at 11 th second actually 11.4547 and so on
How?
Add speed of trains and divide 200 by their sum and you will get time.(If you want proof then ask in comments) You can verify it also:
8.3 × 11.4 = 95 approx
9.16 × 11.4 = 105 approx
95 + 105 = 200 m
Hope you understand the solution
First we will convert kilometers into meters as distance between them is in meters.
30km/h = 30 ×5/18 mps = 150/18 mps = 8.3 m/s
35 km/h = 35 ×5/18 mps = 175/18 mps =9.16 m/s
Taking it into perspective we will count distance covered by each train during each second.
We will see that at these trains meet at 11 th second actually 11.4547 and so on
How?
Add speed of trains and divide 200 by their sum and you will get time.(If you want proof then ask in comments) You can verify it also:
8.3 × 11.4 = 95 approx
9.16 × 11.4 = 105 approx
95 + 105 = 200 m
Hope you understand the solution
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