Answer:

Speed = (54×

18

5

)m/sec=15m/sec

Length of the rain = (15 x 20) m = 300 m

Let the length of the platform be x metres

Then

36

x+300

=15⇒x+300=540⇒x=240m

Answer:

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Step-by-step explanation:

54 km/hr = 54x 5/18= 15 m/s.

Train passes man in 20 secs.

Length of train= time x speed = 20x 15 = 300m.

Train passes platform in 36 secs.

Let platform length be l

(300+l)=36x15

300+l= 540

l=240m

Length of platform= 240m