Question

A train 350m long is travelling at a speed of 108km/hr. If the train takes 40 second to
cross the bridge, then find out the length of the bridge.

answer fast​

Answer 1

Step-by-step explanation:

the length of the bridge is 8.75 m

Answer 2

The length of the bridge is 850 meter.

Step-by-step explanation:

• Let the Length of the bridge = $x$

speed of the train (s) = 108 km/hr = $\dfrac{108\times5}{18}$  = 30 meter/second

Time taken by the train (t) = 40 second

total distance covered by the train (D) = Length of the train + Length of the bridge

                                                          D  = 350 +  $x$

               ∵ speed = $\dfrac{distance}{time}$

            ∴ s × t = D

              30 × 40 =  350 +  $x$

         ∴   $x$  = 1200 - 350

            $x$  = 850 meter

The length of the bridge is 850 meter.