Question

A 125 metre long train travels at 90 km/hr. How much time it take to cross a 175 metre bridge​

Answer 1

Step-by-step explanation:

First convert 90km/hr to m/hr. 90x1000=90,000m/hr

Then divide 90,000 by the number of seconds in an hour (3600)

90,000/3600=25 the train is traveling at 25 m/sec

using the formula v=d/t, which converts to t=d/v, t=175/25

so time=7 seconds.

But that is the time at which the front of the train will cross the 175 meters.

The train is 125 meters long, so at 25 m/sec, it will take another 5 seconds (125/25) for the rear of the train to cross the 175 meter distance.

adding the original 7 seconds to 5 seconds results in 12 seconds.