A goods train leaves a station at a certain time and at a fixed speed. After 6 hours, an express train leaves the same station and moves in the same direction at a uniform speed of 90 kmph. This train catches up the goods train in 4 hours. Find the speed of the goods train.	Choose the correct choice from the following:
A) 36 kmph
B) 40 kmph
C) 30 kmph
D) 42 kmph
E) None of these
Let the speed of the goods train be x kmph.   Distance covered by goods train in 10 hours   = Distance covered by express train in 4 hours.   ∴ 10x = 4 × 90 or x = 36.   So, speed of goods train = 36 kmph.   36 kmphnswer 36 kmph
<result>A</result>
A goods train leaves a station at a certain time and at a fixed speed. After 6 hours, an express train leaves the same station and moves in the same direction at a uniform speed of 90 kmph. This train catches up the goods train in 4 hours. Find the speed of the goods train.