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Quantitative Aptitude

Running in Circles

A train consi...

Question

A train consists of 12 bogies, each bogie being 18 metre long. The train crosses a tree in 18 seconds. Due to some reasons, two bogies were detached. In how much time will the train now cross the tree?

A

12 s

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B

13 s

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C

16 s

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D

15 s

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Solution

The correct option is D
15 s

Length of the train = 216 m

Velocity = $\frac{216}{18}$ = 12 m/s

If two bogies are detached,

The length of the train =180 m

Time = $\frac{180}{12}$ = 15 s

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