Smart Mathematicians Upper Primary-13 Danger Lurks In A Train Tunnel

A train takes 90 minutes to travel from Town A to Town B. The distance between the two towns is 180 km.
What is the average speed of the train in km per hour?
90 minutes = 1.5 hours
Speed = Distance ÷ Time
= 180 km ÷ 90 min
= 180 km ÷ 1.5 hours
= 120 km/h

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