Question

a train 360 m lonh running at a speed of 45km/hr ehat time will take cross 140​

Answer 1

Answer:

40 s :) Hope this helps you!

Step-by-step explanation:

Let's take a look at the question.

A train 360 m long is running at a speed of 45km/hr. What time will it pass a bridge 140 m long?

45km - 5/18 - 25/2 m per sec.

360+140=500 m total distance.

500x2/25 (time is d/t)

Answer is 40 s

Answer 2

★ Correct Question :--------

A train 360 long is running at a speed of 45 km/hr. What time will it take to cross a 140 m long bridge ?

GIVEN :

• A train of 360m long running .
• It's running at the speed of 45 km/h

TO FIND :

• The time taken by train to cross 140 m long bridge = ?

STEP - BY - STEP EXPLAINATION :

→ Speed = 45 km/h ( GIVEN )

→ The time taken by train to cross 140 m long bridge = ?

Therefore, Now for finding the time taken by train to cross 140 metre long bridge ,

=> Speed = 45 km/h

$= > \frac{45 \times 1000}{3600} </u></strong><strong><u>m</u></strong><strong><u> </u></strong><strong><u>/</u></strong><strong><u> </u></strong><strong><u>s</u></strong><strong><u> </u></strong><strong><u>$

$= > \frac{25}{2} m \:</u></strong><strong><u> </u></strong><strong><u>/</u></strong><strong><u> </u></strong><strong><u> s = 12.5 \: m \: </u></strong><strong><u>/</u></strong><strong><u> </u></strong><strong><u>s$

To cross the bridge, the train will have to cover

360 + 140 = 500 m.

Let the required time to cross a bridge be x second.

Clearly , it is the case of direct variation.

=> 12.5/1 = 500/x

=> x = 500/12.5

=> x = 40

Therefore, train will take 40 seconds to cross a 140 m long bridge.