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Q: If mark travels 20km in 5 hours what is his average speed in kmh?
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How fast is 20Km in 6 hours?

If you divide the distance by the time, you'll get the average speed. In this case, the answer will be in km/hour.


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To do this, you need to form equations using the information given. There are 2 variables here, the base speed of the rower with no current (x), and the speed of the current (y). Firstly, convert the distances and times given into average speeds. 20km/2 hours = 10km/h 4km/2 hours = 2km/h The actual speed = the base speed +- the current, depending on direction. So 10 = x + y 2 = x - y If we subtract these 2 equations to eliminate x, we get: 8 = 2y y = 4km/h


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