Question

A train $150m$ long is running at $72$ km/hr. It crosses a bridge in $13$ sec. Find the length of the bridge.

Answer 1

Speed of the train $=72$ km/hr

$=72\times \frac{1000}{3600}$ m/sec

$=72\times \frac{5}{18}$ m/sec

$=20$ m/sec

Time taken to cross the bridge $=13$ sec

Therefore, total distance covered by the train $=20\times 13=260$ m

Therefore, length of the bridge $=260-150=110$ m