Question 527986
Effective Speed = 65 + 85 = 150mph/h
Distance = 375

Time = Distance/speed
Time = 375/150
Time = 2.5 
Time = 2 hours and 30 minutes
Time = (2*60)+30
Time =120+30
Time = 150 minutes


In 150 minutes they will be 375 kilometers apart



Check
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1st Driver will cover a distance of:
Distance = Speed * time
Distance = 65*2.5 = 162.5 kilometers


2nd Driver Two will cover a distance of:
Distance = Speed * time
Distance = 85*2.5 = 212.5 kilometers


Since both are driving in opposite direction:

Distance between two drivers = Distance Covered by 1st driver + Distance covered by 2nd driver
Distance between two drivers = 162.5+212.5 = 375 km