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- Quantitative Aptitude
- Speed Time and Distance
- Problem on Trains
- Train Crossing a Stationary Object or Man

- 360 m
- 240 m
- 480 m
- 400 m

Option 2 : 240 m

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SSC MTS Full Mock Test

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100 Questions
100 Marks
90 Mins

**Given:**

The length of the train = 120 m

Time taken = 20 seconds

Time taken to cross the bridge = 60 seconds

**Formula used:**

S = D/T

Where,

S = Speed

T = Time

D = Distance

l_{1} and l_{2} are the length of the train and bridge respectively.

t_{1} and t_{2} are the time take to cross the signal post and the bridge respectively.

**Calculation:**

When train crosses the signal post,

S = l_{1}/t_{1}

⇒ S = 120/20

⇒ S = 6 m/s ----(1)

When the train crosses the bridge

S = (l_{1} + l_{2})/t_{2}

⇒ 6 = (120 + l_{2})/60

⇒ 360 = 120 + l_{2}

⇒ l_{2} = 240 m

**∴ The length of the bridge is 240 m.**

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