When a train travels at a speed of 100kmph,it reaches the destination on time.when the same train travels at a speed of 50kmph,it reaches its destination 15min late.what is the length of journey? Choose the correct choice from the following answers: A) 15 km B) 50 km C) 60 km D) 85 km E) 95 km

Rationale: let x be the time reached with the speed 100 km / h 50 km / h - - - - > x + 15 distance is equal so 100 ( km / h ) × xhr = 50 ( km / h ) × ( x + 15 ) hr so 100 x = 50 x + 750 so the would be in km and x = 15 answer : a
Answer: A