Question

please give me answer as fast as you can

Answer 1

Question-

A train 100m long is to cross a river bridge of length 800 m what time will it take to cross the bridge give the train moves with the constant speed of 36km/h?

Given-

☛length of the train= 100m

☛length of the bridge = 800m

☛Speed = 36km/h

 

To Find-

☛Time Taken by the train ?

 

Formula to be used-

☛ $\boxed{\bf{s= \dfrac{d}{t} }}$

where,

s= speed

d= distance

t= time

 

Solution-

☛At first change speed km/h to m/s

we know,

1 km = 1000 m

1 hr= 3600 s

so,

$\sf{\implies 1km/h= \dfrac{1000m}{3600s} = \dfrac{5m}{18s} }$

from this

$\sf {\implies 36 km/h = \dfrac{5}{18} \times 36 m/s}$

Speed = 10 m/s

Now,

☛Put the value of speed and distance in given formula

(Here Total distance = 900 m because 100 m of train crosses along 800 m bridge , so Total distance = length of bridge + length of train = 800+100 = 900 m)

 

$\sf{ \implies 10 = \dfrac{900 }{t} }$

   

$\sf{\implies 10\times t = 900}$

 

$\sf{\implies t = \dfrac{900}{10} }$

 

$\sf {\implies t= 90}$

 

$\bf{\underline{\pink{ \therefore Train \ takes \ 90 \ sec \ to \ cross \ the \ bridge. }}}$

Answer 2

Answer:

@loverloser YOUR ANSWER IS ABSOLUTELY CORRECT DEAR ❤️