the distance between DELHI TO Meerut is 75km two trains speed of 100km/h & 80 km/h leave the two station at 8am towards each other at what time will they pass each other

Answer 1

they approach each other at 180 km/h

75 km * (1 h/180 km) = .4167 h

* 60 min/h = 25 minutes
so
8:25 am

Answer 2

actually the express train from Delhi to Meerut seems to go about 44 km/hr by the way:
http://indiarailinfo.com/search/new-delhi-ndls-to-meerut-cantt-mut/664/0/1546