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A 220 m long train running at the speed of 110 km/h crosses another train running in the opposite direction at the speed of 70 km/h in 7 seconds. What is the length of the other train?
1. 130 m
2. 150 m
3. 170 m
4. 100 m

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Correct Answer - Option 1 : 130 m

Given:

Length of 1st train is 220m

Speed of 1st train is 110 km/h

Speed of 2nd train is 70 km/h

Formula Used:

Relative speed of train in opposite direction = S1 + S2

Time = Distance/Speed

Calculation:

Let the length of 2nd train be x

Relative speed of train = 110 + 70 = 180 × 5/18 = 50 m/sec

According to the question;

Time = (220 + x)/50

⇒ 7 = (220 + x)/50

⇒ 350 = 220 + x

⇒ x = 130 m

∴ The length of other train is 130 m

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