Question

a man crosses a bridge in 7.2 seconds. if his speed is 13.2 km an hour ,how long is the bridge?

Answer 1

Answer:

Speed = 13.2 km/h = 3.67 m/s

Time taken to cross bridge = 7.2 seconds

Speed = Distance/Time

⇒ 3.67 = d/7.2

⇒ Distance = 3.67 × 7.2

⇒ Distance = 26.424 metres

Answer 2

Time taken to cross the bridge=7.2 seconds

Speed=13.2km/hr

To change speed into per second-

13.2km=13.2×1000=13200m

60×60=3600

So, speed per sec=13200÷3600

Distance=Speed×Time

=13200÷3600×7.2=26.4m

Answer=26.4m