The 1:30 pm train leaves the station as a prospective passenger reaches the platform. Assuming that the train is going at 40 kmph, and the next train is an Express leaving half an hour later, which will go 50 kmph, when will the passenger reach the same place as the train he missed? Select:
A) 2:00 pm  B) 2:30 pm  C) 3:45 pm  D) 4:00 pm  E) 5:15 pm
Distance covered by the original train in 1/2 hour = 20 km   10 km is compensated for in 1 hour, therefore 20 km will be compensated in 2 hours   So, the Express overtakes the original train at 4 p.m.   Correct Answer: 4:00 pm
<result>D</result>
The 1:30 pm train leaves the station as a prospective passenger reaches the platform. Assuming that the train is going at 40 kmph, and the next train is an Express leaving half an hour later, which will go 50 kmph, when will the passenger reach the same place as the train he missed?