ANSWER:B
Explanation:
First train leaves at 8.00am and second leaves at 9.00am
So,first train that is , from ooty to Chennai has covered
75 km distance in 1 hr.
So , distance left by between the station = 615-75=540km
Now trains are travelling in opposite directions.
We know that if 2 trains are moving in opposite direction then their speed values are added to find the
relative speed.
So,Relative speed = 75+105 kmph
= 180 km/hr
Time taken to cover 180kmph = 540/180
= 3 hrs
Therefore, the time at which both the trains will meet , 3 hr after second train left
i.e., 9.00 am +3 = 12.00 pm