The distance between two cities A and B is 330 km. A train starts from A at 8 am and travels to words B at 60 km/h. Another train starts from B at 9 am and travels towards A at 75km/h. At what time do they meet?
A) 10 am
B) 10 : 30 am
C) 11 am
D) 11: 30 am
Correct Answer:
C
Solution :
Distance travelled by first train in one hour \[=60\times 1=60\,km\] Therefore, distance between two train at 9 am \[=330-60=270\,\text{km}\] Now, Relative speed of two trains \[=60+75=135\,\text{km/h}\] \[\therefore \] Time of meet of two trains \[=\frac{270}{135}=\] After 2 h