Two trains start at the same time, P from A to B and Q from B to A.If they arrive at B and A,respectively, \(2\frac{1}{2}\)hours and 10 hours after they passed each other, and the speed of P is 90 km/hr, then the speed of Q in km/hr is?

Two trains start at the same time, P from A to B and Q from B to A.If

1.	Two trains start at the same time, P from A to B and Q from B to A.If they arrive at B and A,respectively, \(2\frac{1}{2}\)hours and 10 hours after they passed each other, and the speed of P is 90 km/hr, then the speed of Q in km/hr is?
A.	80
B.	75
C.	45
D.	60
Answer» D. 60