Discussion Forum

Two trains 132 m and 108 m in length are running towards each other on parallel lines at the rate of 32 km/hand another at 40 km/h. In what time they be closer to each other from the moment they meet ?

Answer:

Explanation:

Relative speed of the train $=32+40$ = 72 km/h

$=72\times\frac{5}{15}$ = 20 m/sec

Time taken by the trainto pass each other = $\frac{Sum\quad of\quad the\quad length\quad of\quad the\quad trains}{Relative\quad Speed}$

$=\frac{240}{20}$ = 12 seconds