Question

hundred metre long train with the speed of 30 km per hour can cross a man in how much time​

Answer 1

Answer:

Step-by-step explanation:

DISTANCE TRAVELLED = LEGTH OF THE TRAIN , D = 100 M

VELOCITY, V = 30 KM/H

                       = 30*5/18

                       = 8.33 M/S

TIME TAKEN , T=?

VELOCITY = DISTANCE / TIME TAKEN

8.33 = 100/ TIME

TIME = 100/8.33

TIME = 12.004 SECONDS.

NOTE :

TO CONVERT KM/ H TO M/S MULTIPLY BY 5/18

TO CONVERT M/S TO KM /H MULTIPLY BY 18/5.

HOPE THIS HELPS.

Answer 2

$\bold\red{\underline{\underline{Answer:}}}$

$\bold{Train \ will \ take \ 11.9 \ seconds}$

$\bold{to \ cross \ the \ man.}$

$\bold\blue{Explanation}$

$\bold{The \ man \ will \ represent \ as \ a \ point}$

$\bold{Infront \ of \ train.}$

$\bold{Therefore, \ the \ time \ taken \ by \ train}$

$\bold{to \ travel \ the \ distance \ same \ as \ it's }$

$\bold{length \ will \ be \ equal \ to \ time}$

$\bold{taken \ to \ cross \ a \ man \ by \ the \ train.}$

$\bold\orange{Given:}$

$\bold{=>Length \ of \ train= 100 \ m}$

$\bold{=>Speed=30 \ km h^{-1}}$

$\bold\pink{To \ find:}$

$\bold{Time \ taken \ by \ a \ train \ to \ cross \ a \ man.}$

$\bold\green{\underline{\underline{Solution}}}$

$\bold{Speed=30 \ km \ h^{-1}}$

$\bold{1 \ km=1000 \ m}$

$\bold{\therefore{Speed=30000 \ m \ h^{-1}}}$

$\bold{Time=\frac{Distance}{Speed}}$

$\bold{=>Time=\frac{100}{30000}}$

$\bold{=>Time=0.0033 \ h}$

$\bold{1 \ hour = 3600 \ seconds}$

$\bold{\therefore{0.0033 \ h=0.0033×3600 \ seconds}}$

$\bold{\therefore{Time=11.88 \ seconds}}$

$\bold{\therefore{Time=11.9 \ seconds(approx)}}$

$\bold\purple{\tt{\therefore{Train \ will \ take \ 11.9 \ seconds}}}$

$\bold\purple{to \ cross \ the \ man.}$