<PRE><B>Question 618828</B>
Two trains one is Amtrak and the other Mega city Express are running in opposite direction in two parallel rail tracks.
 The speed of Amtrak is 36mph while the speed of Mega city Express in 54 mph.
 A passenger on Amtrak spots that Megacity train passes her window completely in 16 seconds.
 How long is Mega city Express.
:
The relative speed train between the two trains: 54 + 36 = 90 mph
:
Find the portion of an hr is 16 sec, multiply by no of feet covered in 1 hr at 90 mph
:
{{{16/3600}}} * 90 * 5280 = 2112 ft is the length of M train</PRE>