The total time taken by two trains to cross each other is 20 seconds.

1.	The total time taken by two trains to cross each other is 20 seconds. The speed of both the trains is 10 m/s. What is the combined length of both the trains?1. 100 m2. 200 m3. 300 m4. 400 m
Answer» Correct Answer - Option 4 : 400 m Given: Total time taken by two trains to cross each other = 20 seconds Speed of both the trains = 10 m/s Formula used: Relative speed = Sum of lengths of both the trains/Time taken by two trains to cross each other Calculations: Let the sum of lengths of both the trains or the combined length of both the trains be x ∵ The speed of both the trains is equal, they can cross each other only if moving in the opposite direction Relative speed = 10 + 10 = 20 m/s ⇒ 20 = x/20 ⇒ x = 20 × 20 ⇒ x = 400 m ∴ The combined length of both the trains is 400 m

The total time taken by two trains to cross each other is 20 seconds. The speed of both the trains is 10 m/s. What is the combined length of both the trains?1. 100 m2. 200 m3. 300 m4. 400 m

Answer» Correct Answer - Option 4 : 400 m

Given:

Total time taken by two trains to cross each other = 20 seconds

Speed of both the trains = 10 m/s

Formula used:

Relative speed = Sum of lengths of both the trains/Time taken by two trains to cross each other

Calculations:

Let the sum of lengths of both the trains or the combined length of both the trains be x

∵ The speed of both the trains is equal, they can cross each other only if moving in the opposite direction

Relative speed = 10 + 10 = 20 m/s

⇒ 20 = x/20

⇒ x = 20 × 20

⇒ x = 400 m

∴ The combined length of both the trains is 400 m

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