Geraint always cycles to work, leaving at 8am every morning. When he averages 15 km/h, he arrives 10 minutes late. However, when he averages 30 km/h, he arrives 10 minutes early. What speed should he average to arrive on time?
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20,\text{km/h}
21,\text{km/h}
22.5,\text{km/h}
24,\text{km/h}
25,\text{km/h}
Select an option, then submit.
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Junior Kangaroo 2019 (2019)
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