EM-1109
Rate and average speed
E Math · Secondary 3 · Hard · Rate and average speed
A cyclist travels 18 km from town A to town B at an average speed of 12 km/h, and then returns from B to A at an average speed of 9 km/h. What is his average speed for the whole journey?
- 10.3 km/h
- 10.5 km/h
- 9.5 km/h
- 21 km/h
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