Question

The length of a train is half that of the length of a platform. If it is travelling with a speed of 54 km/hr and
crosses the platform in 21/3 minutes, then what is the length of the train?
A. 1400m
B. 700m
C. 2100m
D. 1000m​

Answer 1

Step-by-step explanation:

first take length of platform equal to x then train length will x

Answer 2

$\boxed{\huge{\red{Answer}}}$

$\longrightarrow\huge{Conversion:}$

$\longrightarrow{54km/h}$

$\longrightarrow{(54 \times {\frac{5}{18}})}$

$\longrightarrow{15km/h}$

Train passes man in 20 seconds.

$\longrightarrow{Length\:of\:train=time\times speed}$

$\longrightarrow{20 \times 15}$

$\longrightarrow{300m}$

Train passes platform in 36 seconds.

Let length of platform be = l

So,

( 300 + l ) = 36 × 15

300 + l = 540

l = 240m

Length of platform = 240m

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$\boxed{\huge{\red{Correct Question}}}$

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of train is 54 km/h, what is length of

platform.

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