Posted by **YASH** on Sunday, May 22, 2011 at 6:32am.

A TRAIN IS MOVING ON A STRAIGHT TRCK AND TRAVELS AT A SPEED OF 72KM/HR AND PASSES A POLE BIN 3 SECONDS. FIND THE TJME TAKEN TO PASS A BRIDGE OF LENGTH 540m

- SCIENCE(PHYSICS) -
**drwls**, Sunday, May 22, 2011 at 9:12am
It must be a rather short train if it passes a pole in three seconds.

72 km/h = 20 m/s. The length of the train must be

L = 20 m/s * 3 s = 60 meters

To cross a bridge 540 m long, you have to add the times it takes the engine to cross (540/20 = 27 seconds) and the three seconds needed for the rest of the train to reach the end. That is a total of 30 seconds.

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