Question

a train 160 m long is running at 74 km per hr it cross a bridge in 12 seconds find the length of the bridge ​

Answer 1

Given :

a train 160 m long is running at 74 km per hr it cross a bridge in 12 seconds

To find :

the length of the bridge

Solution :

Let the length of the bridge be x m.

Total length to be crossed = (160 + x) m

⇛ Speed = 74 km/hr

⇛ 74 x 1000/60 x 60

⇛ 74000/3600

⇛ 20.5

Now,

Speed = distance/time

⇛ 20.5 = (160 + x)/12

⇛ 160 + x = 20.5 x 12

⇛ 160 + x = 246

⇛ x = 246 - 160

⇛ 86 m

⁛ Hence, the length of the bridge = 86 m.

Answer 2

Answer:

✡ Question ✡

⬛ A train 160 m long is running at 74 km per hr it cross a bridge in 12 seconds find the length of the bridge

✡ Given ✡

⬛ A train 160 m long is running at 74 km per hr it cross a bridge in 12 seconds.

✡ To Find ✡

⬛ The length of the bridge .

✡ Formula Used ✡

➡ Speed = $\dfrac{distance}{time}$

✡ Solution ✡

✏ Let the length of the bridge be x m

✏ Total length to be crossed be (160+x)m

Given:-

=> Speed = 74 km /hr

=> 74 × $\dfrac{1000}{60}$ × 60

=> $\dfrac{74000}{3600}$

=> Speed = 20.5

Then,

By using the formula we get,

=> 20.5 = ($\dfrac{160+x}{12}$)

=> 160 + x = 20.5 × 12

=> 160 + x = 246

=> x = 246 - 160

=> x = 86

Hence, the length of the bridge is 86 m.

Step-by-step explanation:

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