Two trains A and B leave Kolkata for Sikkim at 8:00 and 8:30 p.m. respectively and run at 90 km per hour and 120 km per hour respectively at what distance from Kolkata will the two trains meet ?

 Two trains A and B leave Kolkata for Sikkim at 8:00 and 8:30 p.m. respectively and run at 90 km per hour and 120 km per hour respectively at what distance from Kolkata will the two trains meet ?


Answer:

First calculate the distance travelled between 8:00-8:30 by trainA

=>90×30/60=45k.m.

we know that distance =time×speed

so we take next time as x

then 90x+45=120x

120x-90x=45

30x=45

x=3/2or 1.5

so after 1hr30 min A and B meet

According to Question B meets A at the distance from Kolkata,

=Distance=Speed×Time

=Distance of B×1.5hrs

=120×1.5=180Km.





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