Question

The "Sunrise" train departs from City A at a specific time. Four hours later, the "Twilight" train leaves the same station and travels in the same direction at a speed of 120 km/hr. If the "Twilight" train catches up to the "Sunrise" train in 12 hours, what is the speed of the "Sunrise" train?

A 55 km/hr
B 75 km/hr
C 90 km/hr
D 65 km/hr
E none of these
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