Question

A girl can run and cross a bridge in 6 and half seconds if the speed is 12 and half kilometre per hour find the length of the bridge

Answer 1

The length of the bridge is 22.75 meters.

Step-by-step explanation:

We have been given that

Time taken to cross the bridge, t = 6.5 seconds

Speed of the girl = 12.5 km/hr

Convert this speed in m/s.

1 km/hr = 0.277778 m/s

Hence,

12.5 km/hr = 12.5 × 0.277778

                  = 3.5 m/s

The relation between time, speed and distance is given by

$v=\frac{s}{t}\\\\s=vt$

Thus, the length of the bridge is given by

l = 3.5 × 6.5

l = 22.75 meters.

#Learn More:

Length of the train is 170 meters and speed of the train is 63 km/hour. this train can pass a bridge in 30 seconds, then find the length of the bridge.

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