- A50 km/h
- B48 km/h
- C45 km/h
- D40 km/h
Step-by-Step Solution
Hill train: 2 h up + 1 h down = 3 h. The level train takes 2.5 h for 120 km → 48 km/h. (45 km/h is the plain mean of 30 and 60.)
Answer: B) 48 km/h
A hill train climbs 60 km at 30 km/h and comes down the same 60 km at 60 km/h. A train on a level 120 km line at a constant speed takes 30 minutes less than the hill train. What is its speed?
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