- A12
- B18
- C20
- D15
Step-by-Step Solution
Original speed = 360/5 = 72 km/h; required speed = 360/4 = 90 km/h; increase = 90 − 72 = 18 km/h.
Answer: B) 18
A train travels 360 km in 5 hours. By how much (in km/h) must its speed be increased to cover the same distance in 4 hours?
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