Question

2. A 270 m long goods train is running at 40.5 km/h. How much time will it take to cross a tree?
1)10 s
2) lis .
3) 12 s
4) 13 S​

Answer 1

Answer:

The answer for the above question is-

3) 12 s

Answer 2

Given:

• Length of a train is 270m
• Speed of train is 40.5km/h

To find :

• How much time will train take to cross a tree.

Solution:

It is given that length of train is 270m long which is running with speed of 40.5km/h. Considering given question, we have to find that how much will train take to cross a tree. So first of all we need to know that in this condition (when a train is crossing any tree or pole) we take only length of train not of tree or poles.

Therefore,

• Distance have to cover = 270m
• Speed = 40.5km/h => $40.5 \times \frac{5}{18}$ = 11.25m/s

We know that :

• $\large{\boxed{\sf{\green{Time\:=\:\dfrac{distance}{speed}}}}}$

Where,

• Distance = 270m ••••(given)
• Speed = 11.25m/s ••••(given)

Let put given values in formula :-

$\large{\sf{Time\:=\:\dfrac{distance}{speed}}}$

$\implies\large{\sf{Time\:=\:\dfrac{270}{11.25}}}$

$\implies\large{\sf{Time\:=\:24}}$

Hence,

• $\large{\boxed{\tt{\pink{Train\:will~take~24~second~to~cross~tree.}}}}$