Time and Distance

Trains, boats, relative speed.

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Q1 · Time and Distance · EASY
A train 150 metres long passes a stationary pole in 10 seconds. What is the speed of the train in kilometres per hour?
Q2 · Time and Distance · MEDIUM
A boat travels 36 km downstream in 3 hours and returns upstream in 6 hours. What is the speed of the boat in still water (in km/h)?
Q3 · Time and Distance · HARD
Two trains 120 metres and 180 metres long are running in opposite directions at speeds of 54 km/h and 72 km/h respectively. How much time (in seconds) will they take to completely cross each other?
Q4 · Time and Distance · EASY
A train travels 180 km in 3 hours. What is its average speed in km/h?