Question

A train of 50m passes from a bridge with speed 30 km/h in 36 s . Find the length of bridge....




There might be some mistakes in the question.... plz overlook them.....



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Answer 1

Answer!

let length of bridge be b meters.

so speed of train= distance/time

=> length of train+length of bridge / time take to cross the bridge

=> (50+b)/36 = 30*5/18 ← converting from kmph to mps

=> 50+ b = 300

=> b = 250m

so the length of the bridge is 250m.

Hope it helps you!

Answer 2

Answer:

250 m

Explanation:

Let the length of the bridge be 'x' metre.

Total distance covered = 50 + x.

Total time taken = 36 s.

Speed = 30 km/hr

           = 30 * (5/18)

           = (25/3) m/sec.

Now,

Speed = Distance/Time

⇒ (25/3) = (50 + x)/36

⇒ 900 = 3(50 + x)

⇒ 900 = 150 + 3x

⇒ 750 = 3x

⇒ x = 250

∴ Length of the bridge = 250 m.

Hope it helps!