A train running at 35 km/hr takes 18 seconds to pass a platform. Next, it takes 12 seconds to pass a man walking at 5 km/hr in the same direction. Find the length of the train and that of the platform.  Choose the correct option:
A) 90m45m  B) 100m50m  C) 50m45m  D) 100/3 m200/3  E) none of these
A train running at 35 km/hr takes 18 seconds to pass a platform. Next, it takes 12 seconds to pass a man walking at 5 km/hr in the same direction. Find the length of the train and that of the platform.   Distance = Speed*time   It's probably best to convert to meters so we can find the length of the platform.   Distance = 35000 meters/h * 18 seconds*(1/60*60)   Distance =(35000*18 / [3600] ) = 175m   I'm not sure how we take the length of the train into account (if we do at all) to solve this problem. For example, If we were measuring by the time the very front of the train passed one end of the platform to the time the very front of the train passed the other end, the result would be different than if we counted when the very front of the train passed one end of the platform to the time the back side of the train passed the end.   As for the problem involving the man, the man is moving forward at a speed of 5km/h while the train is moving forward at a speed of 35km/h. Therefore, the train is moving past the man at a total speed of 30km/h.   distance (35000*18 /  3600  )= 
<gadget id="calculator">(35000*18 /  3600  )</gadget>
<output>175</output>
175m   I'm not sure how we take the length of the train into account (if we do at all) to solve this problem. For example, If we were measuring by the time the very front of the train passed one end of the platform to the time the very front of the train passed the other end, the result would be different than if we counted when the very front of the train passed one end of the platform to the time the back side of the train passed the end.   As for the problem involving the man, the man is moving forward at a speed of 5km/h while the train is moving forward at a speed of 35km/h. Therefore, the train is moving past the man at a total speed of 30km/h.   distance= speed * time   distance = 30km/h * 12 seconds   distance (length of train) = 100 m   We know the length of the train is roughly 100m and the distance covered passing the platform was 175m. However, The platform isn't 125m long - it is 125m minus the length of the train long (or so I think) which is 175-100 or 75m. Both of these answers are not in any answer.   ANSWnone of theseR: none of these) none of these
<result>E</result>
A train running at 35 km/hr takes 18 seconds to pass a platform. Next, it takes 12 seconds to pass a man walking at 5 km/hr in the same direction. Find the length of the train and that of the platform.