The ratio of the speeds of a train and a truck is 5 : 6. If the truck covers a distance of 450 km in 5 hours, what is the speed of the train in km/h?

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**Steps:**

1. Truck speed = $\frac{450}{5}=90$ km/h.
2. Ratio train:truck = $5:6$, so one part = $\frac{90}{6}=15$ km/h.
3. Train speed = $5	imes15=75$ km/h.
4. The train speed is 75 km/h.

FINAL_ANSWER: a

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