A fast train takes 3 hours less than a slow train for a journey of 600 km, If the speed of the slow train is 10 km/hr less than that of the fast train, the speeds of the two trains are  Answers:  A) 60 km/hr and 70 km/hr  B) 50 km/hr and 60 km/hr  C) 40 km/hr and 50 km/hr  D) None of these  E) 30 km/hr and 40 km/hr
=600/x - 600/x+10 = 3/1   Solving this, we get x = 40   Answer: 40 km/hr and 50 km/hr.
<result>C</result>
A fast train takes 3 hours less than a slow train for a journey of 600 km, If the speed of the slow train is 10 km/hr less than that of the fast train, the speeds of the two trains are